[anyfoo]

> but basically in the 80s you mostly only had a choice of 8-bit computers

Ah, that was my confusion. I thought we would compare with systems nowadays, to replace the Amiga.

> A DOS PC could have run a multi-threaded program, but if an issue happened then I guess the whole system would go down

Eh, not really. DOS was for almost all intents and purposes as single threaded as the other systems. Segmentation allowed for some sense of relocation, and this was used for TSRs as "background programs", but that's not much of a departure from any of the other systems you mentioned.

> As for security patches, I was expressing a bit of frustration there because I have seen over and over a Windows "security patch" introduce bugs or break functionality. You didn't have that problem back then with the Amiga. It just worked.

Yeah, but that was only because there simply was no untrusted networking. All the other systems fared the same in that regard. And had the Amiga survived, it would need exactly as much security patching as the other systems.