I don't know why you are confused.
Yes some of the booths can looks like booths in a library although often they are much higher and much more oppressive and crammed in (I am sure you can google if you wish to see).
I am sure some isolation booths can look actually pretty and even inviting.
But I think it is completely wrong to compare them to a library setting, or an office, when the occupant can move around and go to the toilet for more than 15 minutes a day and can lean their head on a desk or get up and move and don't need to keep looking ahead.
Some isolation units don't report who is in isolation and for how long as standard practice.
I don't need to reiterate the bad practice on this discussion.
So isolation booths just confine people without any further education and escalate punishment ie you talk when you are meant to be silent well come back tomorrow for more??
I think if you look at the campaign they are explicit that yes separation may be needed.
See if I was a teacher I would be most interested in knowing if the isolation booths causes further trauma.
Like my little godson who was freaked out and very conscious to not talk and walk that he went mute for a couple of weeks and the school didn't notice by the way and even gave him a sticker for being good.