SuinusLatinus
Ars Tribunus Militum
I mean, the first IBM PCs (well before VGA) had video as a separate card, but everything was a separate card in those. Everyone figured out pretty early on that having seperate video circiutry was the only way to get decent (at the time) performance out of a machine, so they all had some form of it, even though there was very little going on with early video chips other than them being able to do their thing at the same time the CPU was doing something else. Even expanding to non-PCs (even though it's a generic term now, before the late 90s it explicitly meant IBM x86 machines or compatibles), they all had discrete graphics hardware of one kind or another, sometimes integrated onto one board or sometimes replaceable. Nothing really built up a big ecosystem of replacement video cards before the PC though, computer platforms just didn't last long enough back then. Even though the popular ones like the C64 sold for many years, the state of the art changed fast, and if you wanted the best performance and graphics you could buy into a completely new platform basically every year until the late 80s when the PC, Mac, and Amiga started crowding everyone else out. You have to remember, there was no such thing as video drivers or even standards until CGA/EGA/VGA, so if you got a new video card for your random 80s microcomputer (which did exist for some of them), it was probably pretty useless outside a few specific games or peices of software that explicitly supported it.
IBM wasn't interested at all in graphics or games, so third parties had free reign to innovate on video cards without worrying about IBM stepping on them (IBM stuff was also stupidly overpriced, so they weren't really an option for most consumers). Once IBM lost control of "the PC" it was just a free for all with hardware that mostly, sometimes, worked together with everything else, if you were lucky, and had the right software. It's a little annoying with the current Intel/AMD/Nvidia/MS control over everything PC, but it's sure easier a hell of a lot easier to just buy things and have them work as advertised.
Sorry, only saw your reply now. It's weird, I swear your reply wasn't there the last time I posted here.