> I'm currently very frustrated that while CSS Subgrid has been implemented in Firefox Nightly, Chromium has yet to start working on it. Imagine if the Firefox devs' work contributed to Chrome as well! This problem would vanish!
I doubt the problem is too few developers. Google has over $100 billion, it can hire as many people as it wants. And didn't you already say at the beginning, "Google is huuuuuuuuge. They just have so many people working there."
Rather I wonder if there are just only so many people who can collaborate on a codebase, there are just only so many features you can push through at a time. If all the Firefox developers moved to Google, I doubt we would see features faster. I bet we would see features come out at the exact same pace. It is not a matter of labor but of leadership, and each project will prioritize features differently. Therefore this is an argument for more than one implementation.
Is this not the subject of the famous book The Mythical Man Month, by Fred Brooks? Adding more programmers to a late project makes it later. I know that Google is a massive company, but I wonder how many employees literally write code for Chrome.