Futureproofing video on retro computers

Video standards keep moving on but the output from retro computers is often in an obsolete standard. And this is only going to get worse as time goes on. I look at some of the options available to keep retro computers usable in 2021.
Music from www.zapsplat.com

[@MarquePierreSondergaard]

Any other monitors like that BenQ model that gives you the option of multiple input frequencies?

[@wrangleramiga896]

A user on the EAB forum has done a pretty comprehensive list on this subject. See here: eab.abime.net/showthread.php?t=85693