No, it's ready for prime time; I'm working right now on replacing nostr.build with Blossom endpoints-only.

It will default to Primal's blossom server but it will be easily configurable.

In fact, this very screenshot was uploaded from Highlighter to the Satellite blossom instance, and if it were to go down, it would automagically heal.

https://cdn.satellite.earth/eb65cf0b0b6a1ea90180a690661b62acd5429a7419d028bf29ab4174c080cd1d.png