Workflow / Shortcuts was a neat idea that never really worked or expanded beyond a small group of users. I don't think you can really extrapolate "great hackers" from that. The programming interface they exposed was truly awful and the tools around it weren't much better.
I'm not really sure but my recollection from talking to them in 2019 was that it was quite difficult to get features shipped because of e.g. hacking risk.
It's certainly true that iOS's strict sandboxing and aggressive resource management probably made life harder for them, but that doesn't excuse the lack of deep integration for 1p automation. That's the kind of stuff AppleScript allowed two decades prior without any background runtime.
