I like the idea of astro, but never really used it. My main concern is. Does v7 mean that there have been 7 breaking changes thus far? So if I started my project on v1, I had to revise it 6 times to date?

If yes, then this instability is a serious concern to me.

If you are using every single feature Astro has, your code somehow goes through every single branch (of every single dependency), etc then yes, but that'd be a pretty far-fetched scenario!

In practice, our users typically comment quite positively on how little (if any) work major updates requires, and we offer pretty extensive upgrade guides, if that helps.