I agree it's not perfect! But my view is that if they(Google) did the effort todo pagespeed, then lighthouse, then integrate lighthouse in Chrome.. and now in a

I agree it's not perfect! But my view is that if they(Google) did the effort todo pagespeed, then lighthouse, then integrate lighthouse in Chrome.. and now in a separate website... Some of the metrics must be import for your rankings/site - even if only indirectly (slow site etc)