I haven't found their limit, but I have found my limits, of waiting for them to do their thing...
I tend to re-enjoy handrolling code more. I delegate the stuff that annoys me.
We have a large multiplatform codebase, the issue seems to be more the time it takes to navigate the code and reason about it, rather than the size. Arguably the size is causing 'them' to be slower in that regards, but I haven't found the limit yet. And with compaction, it's even less of a problem.
my 5c.