Admittedly, I’d not expect one to arrive at the same or similar conclusions from any one of these links, but from a non-trivial combination… My short answer is: flakes should have been tackling DI, and they explicitly don’t. Won’t. There are diverging opinions on whether bugs are fixable too.
On this note, I was happy to read about the motivations about the “unflake” project announced here the other day, although I didn’t get around to tinkering with yet Unflake: flake dependencies for non-flake projects (and a way to stop writing .follows)