Ah, if you're invested in FSX with add-ons then that's a different story - I only ever played the basic version of it so it was much easier to let it go (I spent a lot more time over the years trying to get it to work adequately and to run and look nice than I did with MSFS2020 fwiw, with very poor results, but apart from cfg tweaks I didn't do anything else such as custom scenery/mods etc.). I do miss some of the planes even in the vanilla FSX version (even have a non-Steam boxed one with the F18, DC3 et al - that roster was pretty sweet I have to say). But for me scenery, weather and flight model (I find 2020's smoother and more customisable but I'm a dirty Xbox pad player ) beat aircraft selection and realism. And yes I do miss helicopters - I know there are a few out there but I'm not interested in those as they're not 'officially' supported yet.Yes you need to do some work to get good results in FSX and XPlane (I don't bother trying in Prepar3d any more).
It is certainly true that you need to get under the bonnet to produce excellence in FSX and it takes a bit of an investment to fly reasonably-modelled airframes over photorealistic scenery in live weather. Saying that, the issue is that flying a turboprop short-haul twin (Twotter, SAAB340 or Dash8 for example) over photorealistic Scotland or Norway just cannot be done in MSFS2020, when we can can I'll consider uninstalling the hundreds of pounds worth of addons I have squeezed into FSX.
I think what you describe in your second sentence is pretty much what I want from it, although I do enjoy learning the little details each plane offers, and a botched ILS approach due to ATC bugs annoys me just as much as the next enthusiast. I'm however glad that I do have a certain level of ignorance when it comes to how realistic the sim is (or hopefully temporary bugs/issues that exist) as that helps keeping me happier about it than others - what irritates me most are the texture issues that occur since patch 5, not sure if they were just a server hiccup in the end or not. Haven't booted up the game since.It all depends on what you want to do with your sim. If you just want to fly planes in pretty environments then sure MSFS is brilliant. If you want to fly a GA sort-of realistically then XPlane11 has your back, if you want to fly a helicopter then XPlane covers that too (brilliantly). However, to emulate certain real-world operations in favourite aircraft and locations then in my case that means FSX until MSFS gets it's turboprops sorted and some suitable decent payware aircraft appear. (Plus of course being able to selectively assign controllers / controls per airframe - that really grips my effluent at the moment in MSFS.)