[lhnz]

It doesn't seem possible to me that "role separation" could be more efficient.

If you wait until code is merged into `master` before doing further testing, you're saving yourself 15 minutes of time, but when a problem is found everybody will be disconnected from the source of the bug.

If you, as a software engineer, pull down the branch and try running the code then you'll be able to find bugs, edge-cases, misunderstandings of the design (etc) and then literally point out where they occurred in the source code to your colleagues at the point of the review.

It saves a bunch of time to do it this way, because it only takes <15 minutes to pull down a branch and execute the code, and finding problems at this point reduces everybody's feedback loop and allows you to give meaningful feedback in relation to the diff of the source code. (Note: I'd not do this with trivial changes.)

(I think the only reason that people rest on "role separation" here is because they've never actually tried doing anything deeper so can't comprehend that it helps to find deeper problems.)