And aren't most browsers (and for sure Chrome) loading the entire page anyway? I mean maybe if you have a slow connection, but for most people with a fast connection it should load everything to avoid that when scrolling down you have something missing.
I really don't see the issue, to me is a useless argument.
A lot of sites do lazy-loading (but even then it's good practice to preconnect to third-party domains) and chrome even implemented native lazy-loading for images and iframes recently.
I really don't see the issue, to me is a useless argument.