Well, how would it help?
Sure, Sentinel can pick of on some strange activity to the point where it's certain that a player is hacking, but it's Sentinels job to ban the ones that it picks up on. Adding this would be great for us, but extremely annoying for the staff members as they'd be spammed with "is x hacking according to sentinel? can you ban them?" which isn't worth their time. They'd be banning players who'd already be banned by Sentinel at a later time.
Instead, they'd be able to spend time actually helping players in Discord or doing reports. That way they'd be more productive.
Aside from that, who says it'll help out in the long run? What if there's no staff members available? Players would assume that they can get anyone banned mid-game, and spam them with the same question I mentioned earlier. What if they're already busy doing something else?
It's just not a good use for staff's time, even though it's great in the players eyes.