alt Hacker News> By the time you’re “at scale” (who knows), and all these monorepo at scale problems start to overwhelm, you can switch strategy, because the economy of polyrepos is so obvious by then.
Conversely to your experience, I have worked at a handful of places who have a monorepo that has been creaking under its own weight for years, but its structure as a monorepo now underpins the business, and so migration to a polyrepo simply never happens, and developers are now checking out a 50GB repo in its entirety periodically.
I'm on the other side of this problem, with a company that went multi repo for bad reasons (political, not technical) and I would give you serious money if you could solve my problems by just forcing me to check out 50gb every now and then...
Instead I deal with a 30+ repo clusterfuck (technically we have 60+ services, but I only have to run half...) that is held together by hopes and prayers, takes literal hours of actual effort to bring everything up to date on master, and has become a fractured hellscape where people are afraid to leave their tightly constrained silos of service combinations.
Long story short... I will take a bad monorepo over bad multirepo any day of the week.