> I guess I have several questions here. Why does that stop us from not running tests in parallel, when was that a goal (even though it is nice).

It was something we discussed in St.Luis. and old one, I guess we could state it's no longer a priority; back then it seemed the tests where getting slower and slower.

> Btw, using mocks is much easier/nicer in some situations (not all of course). But in this particular case we save all these dummy interfaces. I've seen more tests where we could benefit from it.

+1 I agree with introducing them actually. Just playing devil's advocate