I do.
My son is 5 in April, and isn't potty trained. He is autistic, but I do feel like he is very capable.
We have been trying to potty train since nursery started for him which was 3 years ago. Nursery weren't on board with us doing it, kept pushing it back, then before he went to school in September they realised it would be an issue, all our efforts in the holidays were thwarted by their inability to continue our hard work to the routine we had set, and now he is in school, he is out of nappies, but he will not use a toilet for wees or poos and withholds.
We've been supported by the health visitors, GP, SCI team, ERIC, play specialists, alsorts.
I only put my son in nursery because I HAD to work, there's no way I could have delayed working to support him toileting and unfortunately I am a single parent in a mutigenerational and special needs household, with one bathroom, and it seems absolutely impossible to coordinate.
I also did an ERIC toileting course for special needs recently and everything they said contradicted the last.
Make sure you change your children in the bathroom, but we understand bathrooms are sensory nightmares for autistic children and should be avoided when distress is caused, your child doesn't need to show signs of readiness to be toilet trained, but don't push them if they're not ready, don't put nappies or pull ups on your children so they learn to hold it in when they wear pants but put nappies or pull ups on them if they withhold. If your child is demand avoidant, don't create demands for them by making them go, but make them go and create the demand of allowing them to demand things of other people which in itself is a demand.
Absolutely everything was a contradictory nightmare and absolutely no help, just a waste of time, and I really think the only thing that could have helped was my presence at home permanently to get into a strong and established routine, this was before he was diagnosed, before we knew what he needed support wise and I can't go back in time, so now I and school are struggling with a child who isn't toilet trained but isn't seen as an issue because he withholds for hours until he can get a nappy back on, or soil himself trying.