The most successful gaming platform in the beginning of the 90's was the x86 PC. It was the universal gaming machine, capable of running all kind of games: flight simulators, racing games, 1st-person shooters. It was the big winner in a tough competition - without providing hardware sprites and despite all its drawbacks.
You have it.
And so there's no need to re-create something like this. It's already there.
In my basement, in the basement at work, it's still 'round.
Maybe even at your place. It's superseded, obsolete or waiting for its un-burial.
Retro computers have a good share of the past as they bring back old
sentiments, something previously enjoyed. But also, things have changed,
and so you have different displays with different connectors these days, a
new screen aspect ratio etc. So, ideally, you manage to get the old feelings
back using your new hardware and environment.
If you create something entirely new, it will need to bring something with
it that is still missing or was lost on the way to the point of time we're at now.
Something like the SID chip was never again created. Computers these days
aren't hard synced machines anymore. Today's chips have countless unknown errata.
Programs today don't run on "bare metal" as they still used to do on CBM or MS-DOS.
With a new retro computer, you invent something that could or should have been
developed the old days but never was. Get my point?