Yes, not denying that. However, then we could create a profile and correct that and at least USE GSX.
You can't "just" make a profile, which only references parking spots that might change positions/rotations/size, but the general assumption is the underlying structure should be CORRECT.
GSX is not advertised as a fixer for badly made airports, which is completely outside of its scope, since MSFS has a fully featured DevMode editor to create airports, and it would be wrong if we tried to replicate that, allowing users to fix *every* possible mistake in a scenery.
In addition to that, with each update, the internal DevMode editor in MSFS is becoming more and more picky about errors and, for example, the latest version doesn't even allow to compile an airport with isolated parking spots. But of course, if a scenery has been made with a previous version which didn't checked, it will still contain the error.