As a web dev a lot of this is simply ongoing maintenance of a largely unknown quantity. Most web devs know React and use it extensively; Astro is something they'll have to learn on the job or hire for specifically.

It's akin to writing a backend in Haskell. Chances are you could write something performant that leverages FP in a way that serves as a magic bullet for your domain. But now everyone after you needs to learn Haskell and how to model all future problems in a way that conforms with it - or rewrite things again.