I came from FSX with AES. And AES had the disadvantage that i had to pay per airport. The advantage was that after the payment AES worked flawless for that airport. GSX is good...when it works. And i understand that GSX has a huge battle with MSFS coding and sloppy Asobo work: wrong placement of jetways, parking spots. I have flown around the world real time with the PMDG 737-800 and boy i have seen awefuly designed airports: bumps and uneven taxiways, floating buildings and jetways.
Luckily GSX has the tools to setup GSX correctly for a gate. But in case of EHAM for example: there are about 100 gates and i only talk about 1 airport.
The sollution would be to be able to set designated gates at an airport: using the same gate everytime instead of adjusting hundred gates with the GSX adjustment tool.