The absence of LCP reporting doesn’t affect your ability to build a website that works in Safari. My suggestion is to stop embedding eighteen third party performance metric platforms and your website will be faster than any of those platforms could ever make it.

I work in this field too and I’ve heard it all before — and 99% of it is bullshit. Web performance is a solved problem and has been for a decade, unless you build some ridiculous Rube Goldberg machine of libraries atop libraries.