This service is pretty much what I, a software developer, am scared off. I expect that it will be used in order to quickly cobble something together and then hand it over to a dev for "polishing". And this sounds like a total nightmare to me.
If used like that, this service will effectively turn my job into that of an assistant to a machine.
It will happen. Product managers will essentially vibe code and make a thing that mostly works before handing it to developers for 'polishing'.
This could go two ways:
Dumb PMs - "I did most it myself in a week, it shouldn't take developers long to polish".
Smart PMs - "I made an unmaintainable, un-extensible proof of concept (at best) which cannot (and should not) be used as the basis for the real thing. But if(f) it's a better medium for software specifications/requirements than traditional written/visual specs, then it may add some value. The software development process hasn't otherwise changed a whole lot."
Also worth noting that in some ways, a working prototype could be worse than verbal/visual specs, since making the interactivity/clickyness could make it look like it's demonstrating a whole lot, whereas all the tricky little details a dev needs to make the real thing are missing or unspecified.
I wouldn't be scared because in practice we don't see this! Instead we see 1. devs appreciating getting an interactive mockup and 2. the PM having a better sense of what it's like to build technically. (It's pretty cool seeing how AI tools like Magic Patterns help non-technical software professionals naturally learn more about web dev concepts because the best prompts reference code.)
At big companies, Magic Patterns designs are used created & used at the beginning of the product lifecycle for brainstorming and iteration. And there's still a human in the loop in the process: the PM prompting Magic Patterns. The value we create is not the actual raw code, and so we are not seeing teams telling their devs to simply "polish" it. The handoff still is very similar to most dev/design handoffs today, except it's a Magic Patterns design versus a Figma design.
If used like that, this service will effectively turn my job into that of an assistant to a machine.