We already have shifts were almost nobody signs up for security. Cutting the pool of applicatints and raising the bar for command is going to make that significantly worse.
I think we need to find ways for security to be fun, so that we retain experienced security players.
I recently had an incident where security broke their electric chair from zapping a corpse for fun. So when they dragged in another antag for execution (who for sure had not commited a capitol offense) one of the officers yelled "harmbatton execution!" and they all went at it.
Its not one or two new officers, its when most of the officers are new.
I used to main security back in the day. I would not have authorized a harmbaton execution. However the role changed overtime, when I played it almost exclusively, we had more serious command, and security felt like security. We all had security webbing and a bunch of gear, more things were illegal, including harrassing security IIRC (and killing pets and desecrating corpses).
We had laws to enforce and were better armed. Also rounds were slower so when things got bad, we had time to get the armory open.
As that started changing, I started playing BS and kinda gave up on security.
I unlocked Vox, BS, NT Rep, and pod pilot, all on security karma in very short order. It was a different time.