Of course there are going to be tensions, especially if there are increased numbers of people wanting access to the same thing, but I'm not convinced that's what's going on with the SALT and related provision.
There are always movements for change, a wide range of people within those movements, and extremists within those movements.
Going back to the psychiatric survivors and the recovery movement that I mentioned earlier, there were people within those movements who wanted to abolish the system altogether. No psychiatrists, psychiatric drugs, psychiatric hospitals, forced treatment, no nothing. For anyone. Ever. There were also those that wanted very different systems, some quite expensive, and those who wanted reform of the existing ones
Taken over a broad span of time, those who wanted an end to all of it were probably a very small minority within the psychiatric survivor movement as a whole. They were part of a larger movement that wanted to think again about the best ways to think about and manage the kinds of problems that lead to psychiatric involvement, and had experienced the problems with the big mental hospitals and lifelong pathologisation.
It could potentially look like a big moneysaver for those who run services to shut down the hospitals, sack all the psychiatrists, and stop spending money on antipsychotics, and the best part is that you can say, "We're liberating people, giving them exactly what they asked for!" They can't do it completely, of course, because untreated mentally ill people are inconvenient to the general public, and because only a small minority even if psychiatric patients ever wanted the system completely gone. But what they have done is cut mental health inpatient provision way lower than what's needed, and cut outpatient provision to pretty much psychosis and imminent suicide only, all while trumpeting it as liberating and beneficial.
With ASD provision, many of the extremists aren't even those who would've been subject to the treatment they're campaigning against, which makes it more irritating, and makes it more tempting to blame the campaigners. But we know from other fields that it's perfectly possible for services to say "Yes, the extremists want all mental hospitals closed, but the extremists don't have the full picture, and we know hospitals are sometimes necessary, so we're not doing that". The problem is that it's just too tempting for Tories to cut and cut, and point to a group that's asking for something a bit like those cuts.
I'm no neurodiversity activist, and have reservations about parts of the theory and the way that these are expressed in online ND communities. I'm especially resistant to ideas which downplay the needs of some autistic people in favour of euphemistic words and other distortions of reality. But I'd like it if we could find ways for people, and carers of people, with difficulties in this broad area of autism to find commonalities, and I think it would be a mistake if we allowed services' cynical cherrypicking of neurodiversity ideas in pursuit of cost-cutting to drive the wedge even deeper.