I think the problem with units is that fudge, which obscures the issues.
The fudge it that the unit neither delivers the mainstream experience and outcomes, nor fully meets the more complex needs. In those 'reintegration' units DC just cascade downhill in terms of outcomes, often at the expense of MH.
The point of this thread is to have good educational outcomes for bright DC with ASC who can't cope with mainstream. This need is not met currently, there is a huge gap in the market.
DC who get good GCSE results in units probably would get those results with right provisions without a unit, in mainstream alone. All those small groups and 1:1 additional interventions for part of the lessons could be done in MS without a unit, as it was the case for my DS. 5 of the 6 paragraphs in Where's last post are done in MS without a unit.
Children with ASD struggle with transitions, so that business of "some of the week" and "bad days / good days" creates a problem of their own. The provision should enable DC to access mainstream everyday, everyday should be a good day. What good is that DC attend half of history lessons? When are they going to learn history properly? What GCSE results are they going to get? It's almost like some sort of a game, playing 'going to mainstream'. Isn't it better to let them learn full GCSEs on fewer subjects properly with the right provisions?
The 'reintegration' model just doesn't work
hydrotherapy, rebound therapy, therapeutic story writing etc This sounds very specialist to me, very few ASD special schools would do that. Good for your DS.
The many units I visited had nothing of value on offer apart from a separate room, but the non-unit MS also had separate rooms for DS with EHCPs so even that was not an additional provision.
Put and Where, the situations you describe is quite extreme and sounds like a real specialist provision is required, or for Where, delivered in the unit. Possibly because DC accumulated a snowball of issues and reached a crisis due to delays in provisions in primary. What you describe is a provision that is insufficient to meet the needs but is also far beyond mainstream experience, so it sounds to me as the worst of both worlds. I am sorry I don't mean to upset you. I am upset myself about my DD.
It would be better, more cost effective and meet the needs of far more children with ASC to reform the units to be basically a full time small class for ASD only with specialist teaching and curriculum adaptations (like emotional wellbeing and therapeutic story writing) within a MS facilities which aims to accelerate those children's progress to grades 4-9 while broadly delivering the experience and facilities of a MS school.
The problem is that there are hardly any provisions that deliver good outcomes for ASD children without intellectual disabilities. My DD does not just need therapies, she needs good GCSEs and A levels.