And re: Zapier: yes, that’s the key to Zapier, from my experience: usage in marketing and the “power user” base.
Re: shortcuts: (I live in the Apple ecosystem) Shortcuts + AppleScript is gold on macOS. Shortcuts + iOS is about to be game changing - it already changed the game, it’s just nobody has been playing it, because it’s not “fun”.
After Siri+Gemini+Shortcuts, everyone will be playing it, I suspect, even on Android, it will get built somehow.
n8n, node-RED and others already exist. There are many tools for automations, and I guess most of them can also do cron-like jobs.
Consumer grade automations built on node-RED? I suppose it depends on the market, but most people aren’t going to want to fiddle with it, I suspect.
A plugin for Chrome might be able to take off though, or some killer mobile app, but it needs to run on a cheap phone and control things without having to keep track of loops and logic and variables and all the fun stuff.