I am an insider to this space and I think you are probably an outsider.
That link doesn’t say what you think it does.
LCP before optimization is a cause of what? For example, a complex product page. Well of course that will convert worse, because the product is complicated.
But not too simple! 0.5s performs as bad as 2s.
Anyway, in my real experience, conversion fluctuates so much across products, the range greatly exceeds the impact measured by aggregate conversions by LCP, so your interpretation is wrong.
That link doesn’t say what you think it does.
LCP before optimization is a cause of what? For example, a complex product page. Well of course that will convert worse, because the product is complicated.
But not too simple! 0.5s performs as bad as 2s.
Anyway, in my real experience, conversion fluctuates so much across products, the range greatly exceeds the impact measured by aggregate conversions by LCP, so your interpretation is wrong.