The big blocker is actually TLS. Without it lots of tools including browsers are blocked. Now with AI I bet it is manageable, before that the effort required resulted in what you see, almost nothing.
TLS is not really that much of a blocker, nor was AI necessary to clear that hurdle (albeit crypto is fundamentally "just maths" and thus very, very portable): https://news.ycombinator.com/item?id=36486512
It’s a blocker bc it’s complex and not available. By blocker I mean huge hurdle, not so much saying it’s impossible. Your link shows work has been done there.
modern tls libraries on classic macs has been available for at least 6 years, and was pretty easily possible sooner if anyone bothered, no AI needed
A library and working OS utilities including a browser are not the same thing. A year or so ago I was able to get 1 very old browser working but nothing else had TLS. The browser also didn’t have modern JS which is another similar non-trivial issue.