Looks promising - I’m a fan of the general pattern of taking dev tool inventions from big companies (in this case Google) and bringing them to developers everywhere.
I'm sure the web page is enough to populate their waitlist and thus met its foals, but as a HN submission this feels awful. There's just nothing of substanance to talk about.
So far, I'm using Flutter and codemagic to do builds, relying on web and android debugging during development, and friends' bug reports through testflight for ios dealbreakers. Being able to debug ios during development would be nice.