I've been reading about the issues Sony is having with their PS1 games they're starting to put on PS Plus (a la the Nintendo Switch online service), namely the problem with the frame rate of the PAL versions of certain games and the fix for this issue which turned out to be a lateral move at best.

I believe Nintendo is/was having bad issues with some of their N64 games on their online service as well.

How can huge, rich companies not get this right when countless independent developers have made these kinds of emulators for years with a much better result, essentially for free?

This is not a gripe only partially a gripe, I am genuinely curious if anyone had any insight into why this seems to keep happening.