gitlab heads-up: approval feature enabled for MRs

[Hal Murray]

devel at ntpsec.org said:
> There are no panaceas, but enabling this feature in Gitlab means that we can
> use it when we're ready for it. 

I'm missing the big picture.  I don't use merge requests.  I just do a git 
push.

What are the advantagesof a merge request if the submitter has write access?

Is there a way to setup things not actually accept merges or pushes until 
they pass the build tests?  (at least by default)

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