Maybe your team is only doing sensible things and all is perfect. Maybe you're blind to things that could be better. Heuristically, if you're writing software, it's not likely to be the first case.
My professional project moved to GitHub recently. It is terrible. The pull request / review system is borderline unusable. But already I can feel myself adopting clumsy workarounds and losing sight of how much better it should be.
If they'd had someone do the former, most of the time they'd not have needed the latter quite so much.
but maybe that’s just me.
You don't need a new hire to fix those problems, but it certainly helps shed new light on some problems. Especially if you are hired as a senior dev or a team lead, you will be expected to fix some of those things.