When I used to run super smash brothers melee tournaments in my old apartment basement I had 4 CRTs.

I still have one tiny CRT, the size of the screen is very small - roughly a banana from corner to corner.

CRTs are absolutely required for in person melee tournaments. Playing not on CRTs introduces input lag of a few frames.

There are 60 frames in a second in melee - so it's roughly one frame per millisecond.

You may not think that is that big of a deal - but when a specific move has a 4-7 frame window, input lag becomes a problem.

If you ever watch a melee tournament on YouTube or in person, you will either see CRTs everywhere, or computers emulating melee.

When emulated there isn't input lag. The lag comes from the conversion needed to display melee on a non CRT TV I believe.