Lighthouse != Lighthouse The specific hardware and network *matter* https://www.webpagetest.org/easy is your friend (and mine!)https://twitter.com/slightlylate/status/1167146404755566592 …
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I think one of the most important pieces to focus on is RUM metrics so you actually get real data from your users and how much performance impacts the bottom line. I don't think enough engineers set SLOs around performance and measure what matters.
Even with RUM you have to be careful and account for abandons as part of "perf" since the population changes as perf changes (or just swings wildly for the heck of it)
And that is definitely a bug.
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