Yes definitely worth using it, but I don't know how much time I want to spend integrating it deeply into my own open source projects given its uncertain status.

Yeah I know what you mean... one positive is it looks like Google use it in Chromium[0], so at least Google think the API will stick around for a while (and provides a big platform Apple would break if they discontinued it)

0: https://chromium.googlesource.com/chromium/src/+/refs/heads/...