The answer to that, which you've artfully failed to mention, @LolaSmiles, is that the students should be working in the classroom. Particularly the children with SEN who form far too high a proportion of those sent off to these spiffy desks
There's no artful anything 
How many times do you believe it's acceptable for 29 other students to have their learning disrupted a day?
I outlined how many disruptions to learning would happen in my school before a child is removed from a lesson. Each step of the way there is an opportunity to make positive choices, and we have an excellent SEN base and SEN team.
What people who are flat out anti-isolation never seem to explain is how much learning hundreds of students should miss in the name of their cause. They claim to care about lost learning, but never for the 29 other children in the room How many children are you happy to miss out on the grades and education they deserve in order to keep a minority of students in the classroom based on nothing more than an ideological objection to students working in a study room at a single study desk for a short period of time?
How many victims of assault and bullying should have to remain in class with the perpetrators in the name of keeping everyone in the classroom?
How many times should staff accept being threatened, verbally abused and assaulted in the name of keeping students working in the classroom?
(And again, it goes without saying if isolation is being used inappropriately it should be challenged, but that is totally different to thinking students should be kept in the classroom)