As someone who spent a decade at FB I can assure you that we had as few monorepos as possible. No more, no less.

The danger with mouthing off on HN is that this place is thick as thieves with people who actually do or did what the bloggers whinge on about.

Though in this case, the blogger has worked at all three of MS, Google, and Twitter, so I wouldn’t be quick to disregard him either.