Yeah, once OS-9 came out we got some decent game ports too. That’s where I discovered Epyx Rogue! It was very late in the lifespan of the system though.
C64/128 was what I was thinking of more than anything re 8-bit competition, keeping in mind I’m talking mid-late 80s by this point. I do also remember Atari 800 (and later) doing considerably better than you imply. But you’re right, Apple captured the early-mid 80s gaming market nicely.
Atari 800 featured powerful video processing with display lists and sprites, 4-channel audio, etc., but was much less successful.
As I understand it, Radio Shack did not encourage third-party software and support for its systems, not realizing that it was the key to success.
OS-9, originally a 6809 OS, seems to have survived for quite some time.
https://en.wikipedia.org/wiki/OS-9