It's not benefit bashing to say you should only be given what you need. The aim is to get people scaling down when in a property bigger than their circumstances dictate
Nope,the only circumstances that come into it are amount of household members (unless you fit into the two exempt groups of HB claiments then they also take into account two other circumstances)
They do not take into account indervidual circumstances such as adult disability status and equipment needed or even if the additional room fits the legal criteria to be considered as a bedroom or if its large enough to fit more than one bed in it (or even in some cases even fit one bed) any child protection concerns with bedroom sharing possible residency transfers for the same reason,any adaptations required that may make a bedroom no longer able to be used as one,any adaptations made to house making you unable to be moved as well as the many other reasons why the LA may tell you that you require a room for xyz reason and that's why they gave you a larger house in the first place.
The largest group (largest by a huge huge amount) of under occupiers (over 61's) are totally exempt from the rule as is the second largest group of under occupiers (LA house but no HB) and the group with the highest amount of none exempt (disabled household member over 16) people are mostly unable to be moved by the LA due to allocation rules and nobody in there right mind would state they should be. The small amount of people who most people think are effected by this that should be are negligible enough not to really matter.
And it still has not resulted in any great free up of houses and it won't because the small houses do not exist in any difference making amount and the largest groups either don't have to or can't be moved.