>wildly underestimate how many engineers work on Chrome.

It is completely insane how many people work on Chrome. It seems like it is time to deprecate web browsers and do something different. Like you get a frame-buffer to draw on with something like a wasm vm. Web pages get replaced by programs (which they essentially are anyway). Get rid of 99.9% of the cruft that has accumulated over the decades in browsers. If you want to have some of that cruft, that is a library you have to send.

Or go the other way and make web pages not programs at all, like they originally were. Unfortunately, just communicating information isn't cool, doesn't monetize, and certainly doesn't get clicks.