My biggest complaint is that Lighthouse has a longstanding open bug where out-of-process iframes are counted in the main thread, thus causing third party embeds

My biggest complaint is that Lighthouse has a longstanding open bug where out-of-process iframes are counted in the main thread, thus causing third party embeds to wildly degrade the LH score, even when real performance is not affected much. This even happens to Google's own YouTube embed. Add one YT video to a page and see how destructive it is to a LH score. It's really difficult to explain to customers when they track their LH score like a professional bodybuilder tracks fat percentages.