The 5:4 aspect ratio and "1280x1024" being a standard resolution always drove me crazy. It didn't fit in with the rest of the standard PC resolutions and aspect ratios. Don't get me started on games that only provided options for 800x600, 1024x768, 1280x1024 and 1600x1200. Arghh... 🤣
I used CRTs exclusively until 2010-2011 and actually went back to a high end CRT for a while in 2015 before buying one of the most CRT-like LCDs on the market (BenQ XL2720Z).
For old games there's just nothing like a CRT... and almost every one of those is 4:3 (except for the Sony GDM-FW900 and maybe a few others).
In short, I'd go out of my way to get something that was 4:3 if I was the kind of person that put a lot of money and time into retro-computing... I still have my big huge CRT, I have two more decent ones storage, plus the IBM 5153 CGA CRT on my 5150. The only thing I use a 5:4 LCD for is a basic screen for testing computers because I don't want to waste the lifetime of my CRT with hours of DOS prompts and stress tests... I still have to use the CRT many times though because lots of older systems don't get along with my 5:4 LCD.
Now for some blitting from the back buffer.