Comment by Eridrus

I basically agree.

But also, CI should be the last line of defense, not the first line.

If your system is not byzantine, you should be able to run almost all your tests locally and not need to boot a cloud machine that has to be setup from scratch and deal with all the overhead in your core loop.

Having a build system that knows what tests need to be run helps here since you're no longer just throwing compute at the problem.