[aflag]

I don't see how prs would help solving any of those. It's common for me to use a few of these commands before I open the PR.

[Sammi]

They stop you from pushing anything broken to master. So you only have to worry about being in a broken state locally on your machine, not about accidentally breaking master for everybody.

Ideally your code review system should be the only one to have merge rights to master. Then nobody can singularly break master at least.