When dd was in the language unit, the head told one of their TAs to spend a week painting a mural of the solar system in the entrance hall. He even proudly wrote about it in the weekly newsletter! The language unit parents were incensed!
IMO, the people's elected representatives either through central government or local government have set the criteria for statementing (which are usually severe at local level) and deemed those children as needing help in the classroom - the amount, having been determined by professionals such as educational psychologists, if necessary at Tribunal, another function of the government. Teachers do not have the expertise or right to decide the most severely affected SEN children don't need the support, on the grounds that non-statemented children do. IMO, its theft and misappropriation of taxpayers money!
I imagine teachers would not like it, if their GP prescribed them medication and the pharmacist substituted half the drugs with a placebo, to save the NHS money? Or, if a burglar broke into their home and took all their electronic goods, because he's poor and they clearly have good jobs, money, a home, etc? I bet they would say a burglar has no right to just steal their stuff, they have worked hard for?
If teachers can't cope in the classroom, then the teaching unions should take the matter of the SEN system up with the government - rather than cravenly stealing off the most disadvantaged children!
I've also often heard LA officers or teachers say, as an excuse to parents "Well, those children's parents don't have the wherewithal to get them a statement...." That is emotional blackmail, and the answer from parents should be "Well, I only have the time, energy and resources to look after my own children. It is up to the SENCO to put those children forward for statementing, help their parents with the letter writing, etc!"