> I really wish they'd crammed a SID chip into the Amiga alongside Paula

This is something the Apple IIgs had. It had an extremely capable synthesiser with good graphics and performance capped so not to compete with Macs. It was a weird machine, a sharp contrast with the minimalistic Apple IIs that preceded, over complicated and trying to be too many things at once.

For the same reason I prefer the design of the ST over the Amiga’s. Amiga made lots of assumptions about the use that ended up tuning it well to platform games and NTSC video editing, but nothing else.

Important fun fact, this synthesizer was an Ensoniq chip (ES5503 DOC), designed by Bob Yannes, the inventor of the SID chip. The IIGS was actually a cool machine, not very successful unfortunately.

I'd love to have a IIgs in my collection these days, its truly the pinnacle computer of its type and era.