99ing gates is very bad
Here's a good idea, let's make some perks activate when exit gates open, then give survivors absolutely no incentive to open them until the exact moment they want to leave.
Survivors should lose all progress on the switch if they release it. Increasing the time it takes to power it up is not a solution. Maybe the gate could take 10 seconds to open instead instead.
Either way, If there is anything that survivors should be able to slowly inch open it should be the hatch. Make it so when the hatch can be reopened during end game collapse once it's closed. When survivors go to open it the killer can hear when it's almost open by a rattling sound it makes, but only when in 5 meters of it.
Now blood warden isn't useless, no on left behind isn't useless and survivors don't get undeserved escapes because one of the gates had a billion lockers near it.