Of course people will not change their virusprotection providers in order to have FSDT working properly.
You are making it sound as if I said that "everybody" should change their virus protection, regardless which one it is.
That's not what I said, I said THAT particular antivirus product, McAfee, that has an obvious weakness, and it's the inability to add a whole folder to its Exclusions, and this is a serious shortcoming of THAT particular product, if McAfee decided to design their product to be very unique ( I think it's the only one that lacks that ability ), it would be wrong and not doing you a complete service by not disclosing it.
It seems, according to the thread you refer to that the this might be a MS problem?
That thread suggested several reasons, one of them was surely an MSFS problem and pointed out with evidence Asobo was aware of it so, clearly, it COULD have been an MSFS issue.
And also, if I understand this correct, the traybar solution offers a restart option while just starting the exe file don't do that or??
No, you'll always have a tray bar icon, regardless how you started the program.
The icon is there now, I noticed that (from the thread you're referring to) that having MSFS running as admin could be the solution, and that it was. (A bit tricky to apply it in the steam -version)
This is not normally required. It might be, if your normal user account has limited permissions.
Our program, by itself, doesn't really require admin permission but, if I understood correctly, the problem here is not really the antivirus ( otherwise it wouldn't start in either case ), just the automatic startup from the simulator itself.