There's a middle tier, broad tests in the sense of not mocking local dependencies but only external (slow) ones.

Many developers mock every dependency in a SUT, even if they own the dependency. I like the idea of broad tests that run-in memory (no I/O interaction).

I think Ian Cooper does a great work explaining it in this talk (he talks about TDD, but I think the main idea applies even if you write tests after code): https://www.youtube.com/watch?v=EZ05e7EMOLM&ab_channel=DevTe...