Don't get this wrong, but I have paid around 90 bucks for this add-on, and for sure, I do like it.
Not sure which add-on you are referring to. A 90$ airplane that works with GSX ?
However, from my payment raises a certain expectation, especially when a certain feature which is incorporated is not available anymore out of the sudden.
Easy user-customization of vehicles, using the provided Paint Kit
Directly from SimMarket
GSX supports FSX, FSX:SE, P3D V1, 2, 3, 4 and 5. Not all features are available in ALL simulators. For example, FSX and P3D1-3 users don't have PBR, P3D4/5 users do. It's impossible to make a synthetic description of all features available on all different simulators.
But of course, GSX has a TRIAL version and works in an unlimited way on all FSDT sceneries too. You have been given plenty of chances to test it and see what it does, read the manual, etc.
GPU does not arrive during turn-arounds (only occasionally)
Not sure what you are trying to say here with "turn-arounds". GSX doesn't have the concept of turn-around.
YOU are supposed to call the GPU so, it's not that it "arrives" or "doesn't arrive". Are you many referring to a 3rd party airplane that is SUPPOSED to call the GSX GPU turning its own turn-around simulation, and that's not working for some reason ?
Ground Handling / Catering not adjustable at the moment
What do you mean with "adjustable" ? Livery customization ? Yes, if you use P3D V5, liveries are not customizable like they are in P3D4, because we used DX11, which is not supported anymore in P3D V5, we are looking into an alternate solution using the new HTML5 RTT feature in 5.1, but it still not complete, because it requires support for non-square texture which is currently not working, so we'll require further updates from LM to make it work.
GSX menu is stuck during SimConnect issues during turn-arounds
Not a GSX bug, of course, but a bug of the Simconnect Html5 menu itself, which can be solved by reverting from Html5 menu to Scaleform menu ( as discussed in other threads ), proving the problem was never GSX to begin with.
NLG tug (the one without tow bar) still triggers the Ramp Agent to "pump up" the tow bar
That's the only valid point you have. That animation hasn't changed in a while, but we wanted to redo it entirely from a total pushback rewamp that will arrive later. MSFS arrival has changed all of that, so our first priority is to make it GSX working there, and of course with that all animations will be updated as well.
Fuel Truck is stuck even when refueling is finsihed and fuel truck has already disappeared
No, it's not. If you think it is, then make a proper reproducible report, indicating the airplane you are using, and the precise, exact, sequence of operations you did, including the precise, exact quantities of fuel you had before and after and how much you requested.
Having doors opened manually, for example the LH AFT Exit door on the A320FAM series and standing at the gate, requesting the fuel truck, blocks it.
What's an "A320 FAM" ? It's an airplane that controls GSX by itself ?
Instead of that GSX just checks a) Door Open -> Close door b) Send Fuel Truck, it's simply stuck requiring some action from the user.
It seems you are still confusing what the *AIRPLANE* is waiting, with what GSX is waiting. GSX Fuel Truck has NO relationship with any of the door's status. That is normally, when GSX works by itself, and is not controlled by the airplane. If you think GSX is stuck with Fuel because of a door open or closed, that can only be something happening in the custom airplane GSX automation that is not working ( and can only be fixed by the plane developers ), because nothing in the GSX own code has any tie between any of the doors status and the service Fuel.
And I don't even know why a stair should block the fuel truck which is not even standing in it's area? I don't get why the logic is not changed so a fuel truck can be used on the left-hand side while passengers are boarding, like it's done on bigger major airports on a daily-basis.
This has been explained so many times already: GSX vehicles are not really aware of each other, not in a way that can be "smart" enough to drive around each other automatically. No program out there, not even those with budgets and teams 1000 times larger than us have completely fixed this issue, think how hard it is for cars to self-drive or how many glitches there are in GTA V car traffic, so even if something CAN be done in real life, it doesn't mean GSX could do it the same without having vehicles doing funny things or drive into each other or, if we tried to add auto-avoidance and self awareness, a whole new class of bugs we don't have now will open, due to possible traffic deadlocks on the limited apron space, due to vehicles yielding to each other, not knowing what to do.
Because of this, we try to prevent what would surely be seen as worse bug, by preventing them before they can happen, meaning doing some services in sequence, even if in reality they could be done simultaneously.
GSX is a great add-on, without doubt. Especially beacuse it usually brings a lot of immersion. But at this current stage...
GSX at a current stage is a mature and perfectly fine product, which most of the time works, provided the user understand which are really GSX "bugs", which are bugs of the simulator, which are bugs of the 3rd party airplane that is interfacing with GSX and which one are instead compromises that make sense which were done to prevent worse problems.