I've just gone back to play New Vegas after a long, dreary stint with Fallout 4, and I've just confirmed that my fears of Fallout 4's technological advancements making New Vegas look bad has been banished. I usually have a habit of occasionally not being able to play previous games in a series because the sequel was too far an improvement over the old one to ever go back, no matter how much nostalgia fuel it was. This wasn't the case.
New Vegas is as great as it ever was. Better even, in comparison. I'm not sure why I ever worried. My two only gripes are the piss-poor performance, which I'm sure will be a fixed problem as soon as I install the 4GB patch, and the character creation, the sole improvement that Fallout 4 had over all the other games. Apart from that, it's back to me enjoying my stay in fabulous New Vegas.
Ah, I've missed the Mojave.