I’ve experienced & witnessed GAS across a couple of genres and the differences between the way synths and other string based instruments work is quite interesting to compare. My general feeling is that when people ponder or worry about their gear situation; these folks are one step ahead of those who literally never consider things at all.
Spending money you don’t have (or even worse prioritising spending money you don’t have) over real life stuff is probably not a good idea. Selling stuff without really using it is also somewhat questionable, unless you literally hate the thing you bought. Both of these things are rabbit holes that can be damaging financially and artistically.
But a bit of context is very much a good thing. A lot of GAS is driven by the fact that no external gear is technically needed to make most kinds of electronic music, unlike say playing in a band. But to be fair, VSTas is very much a thing too, but that one is less visible. If gear (of any kind) is a rabbit hole you want to try, spending within a sensible budget is absolutely fine if it’s towards a hobby you enjoy, even if that means a few (or a lot of) mis-steps along the way. We’re not robots and the idea that you’ll buy the perfect setup out of the gate seems unlikely.
It’s OK to think “yeah but just that one swap would make it perfect.” We all know that this is rarely true, but thinking it might happen is just human. If you want to swap something, as long as you’ve spent time with your gear, and you’re sure you can’t get what you want out of what already have, don’t sweat it. That said, it’s not happening after multiple changes, then stopping for a while to re-asess the bigger picture is sensible, as more or different gear is unlikely to be the problem.
Within certain paramaters and with moderation, I don’t see anything wrong with folks having a bunch of devices or none at all. Music isn’t a mechanical process of optimisation, where each piece of gear has to be used to it’s full extent to make polished, finished music. So don’t kill yourself for swapping machines that you can afford. But do be wary if it’s becoming a habit, costing you too much money or (most importantly) if it’s taking you away to the extent that you’re far removed from noodling/jamming/writing/recording.