I'm getting pretty decent with the sentinel, 2x scope is my jam. I don't think they should buff the bolt action anymore despite it being quite slow, that would encroach on the longbow.
But perhaps if you land a shot enemies should be slowed considerably for at least the duration of your bolt cycling.
The game is a bit too cartoony in some respects, you just got hit by a sniper bullet but you're still able to move pretty fast. And rush down the sniper without too much issue.
Movement slow is a mechanic that feels bad when you're the victim but helps a lot when you are the one shooting.
It's a tough one to balance so I'm not sure, if I'm even in favor of this. But I feel like the sentinel is so close to being balanced, it's just missing something but I can't put my finger on what.
Source: https://www.reddit.com/r/apexlegends/comments/fg4bna/do_you_guys_think_the_sentinel_is_balanced_now/