For what it's worth, as a Meta employee, I generally disagree with this comment. I mean, calling it 'inferior' is just laughable. It's way better than what open source projects have access to and it's way better than Amazon internal tooling (is that 'industry standard' enough?).

The sapling workflow is better than git. I was skeptical when I joined, but between no branches and excellent stack and merge support, it's just a better, more intuitive workflow.

Eden is fast. Crazy fast, in fact, if you look at the size of the monorepo. The comment about small files is odd to me. Source code are small files. The entire monorepo is just small files.

Now if we are going to complain about something, it would be the custom Android environment we've got. Android Studio integration is actually clunky, bordering on non-existent. Compared to writing vanilla Android code, which I have done for years before joining Meta, Meta folks wrapped almost every API, so all your pre-existing Android knowledge is useless. I've never been so unproductive when writing Android code.