Honestly, I am not overly concerned by the admin issue… I too run with admin priviledges on my account but there are instances where Windows will still require elevation confirmation to terminate services or access other system level components. Perhaps Windows 11 is even more zealous in this regard - I have yet to bang my head against that particular wall.
GPU drivers - not sure what you mean by “Manufacturers software” handling the updates - the issue re clean vs upgrade is that an upgrade install doesnt always remove older driver components or replace older ones for whatever reason and this has been proven to cause serious problems - especially for graphic intensive things like games… It used to be that you had to do a safe mode or DDU install process to ensure that drivers were correctly updated - thankfully drivers from Nvidia/AMD now have the clean install option which makes it easier… Without seeing your diagnostics to check if LE is crashing on GPU driver components, this is just guess work at a usual break point - especially because of the partical system errors you were having.
The game stability is, imho, very dependant on each persons hardware setup vs the in-game settings they use. Sometimes a persons expectations can also play into the stability issue because they forget that the game is beta and assume their hardware should be capable of more. It is seldom that the game crashes for an actual code bug although it can obviously happen with a beta game. To use my own situation as an example, I have played almost 1800h now and have had less than 6 or so crashes when I am just playing the game… When I have been testing, I can almost cause crashes, freezing, lag spikes on demand simply by changing in-game settings. I can cause particle system & other graphical errors almost on demand especially if I open map locations in the game that are known to cause issues.
My general advice for stability is to be conservative with settings until the devs release more optimised code - thankfully they have committed to doing so for the Sept update… but only time will tell.