My personal thoughts are that this is a good idea in concept. I'm sure the idea came up in good faith.
However, this hinders some antags, and the ones that it doesn't hinder, it makes nearly invincible. Ninjas and mercenaries, for example, can just retreat into maints for a big portion of the round until security regroups and gets maint access or the access restriction is lifted - both take quite a lot of time.
I think security needs their maint access back at the bare minimum. The rest can go.