I'm writing this on 2015 MBP 15" with Mojave (use it for iPhoto and Aperture), and while it's still running ok (CPU and GPU is fine for light browsing and stuff), web browsers are a bit of a problem. Firefox ESR still has security support, but Safari is ancient. And I can't find a browser that can actually browse "everything", pages like Samsung Shop use too modern pictures or something, it just won't load properly. But I also run parallels Desktop and Linux Mint + Windows 10 ESR, so, can get around that.
My daughters Macbook Pro 2012 Retina 15" (mentioned earlier in thread) is dual booting Ventura and Windows 10 LTSC, she can play some games and run any browser, office package and watch films. OCLP.
Older 2008 MBP is half retired, core 2 duo struggle with web pages these days, even with 6GB RAM (max) and SSD. 2009 MBP a bit better, with 8GB, still used by my son (he also has gaming PC).
While Apple hardware is good, Apple don't really support legacy systems well, never has. Dropped PPC fast, first intel gen dropped fast, dropped optical drives, 32 bit support, and so on. And that is both good and bad, and very Apple.