It absolutely does, though. Vanilla crashes all the time and has several game-breaking bugs. I don't recommend that anyone plays New Vegas unmodded – especially on a newer machine that'll be less compatible (like my 7700X + 4090 rig running Windows 11) – unless you just hate yourself. You need community patches to get it in a playable state.
Same goes for Fallout 3. It's not nearly as buggy as NV, of course, but try running it Vanilla on a modern Windows 11 machine and let me know how well that goes for you lol. You get massive framerate dips and it literally crashes every 5 minutes on a brand new PC if you don't install any mods to make it compatible.
I mean I still play it on a modern system mostly unmodded (I do minor QOL mods like adding/moving fast travel points to limit loading screens but nothing super fancy or specifically for performance). Still on windows 10, though. I get no performance issues, though crashing is still a worry. It's not like every 30 minutes tho, like when it was new 🤣
Windows 11 is essentially a skin and experience pack for win 10, in fact it was.originally going to be the nezt update to 10. very little has changed that will affect how games run.
I mean, isn't vanilla New Vegas pretty famously unoptimized? I think its performance has less to do with your hardware and more to do with the engine (hence this mod).
My toaster of a desktop can easily run the game at pretty good framerates yet the game just sometimes decided to just crash like it's nobody's business.
Hell, it ran it just fine before getting an upgrade from 4gb to something like 16gb of ram, but the problem wasn't performance issues. Instead it was random crashing. Mods completely fixed that issue.
New Vegas is a pretty good game, but I wouldn't wanna play it unmodded because I don't wanna deal with random crashes.