Of course, no box fits everyone, and I totally get what you're saying. I think what I'm saying, with his level of Autism, I think just being a good friend is enough support and doesn't warrant free tickets. I mean we can go into a restaurant, and he's more triggered than at a theme park and I often have to step in, but I don't demand my food is free/discounted from that business. By demanding free this and that, you're holding a business back. (not that you personally are) The UK is good (not great... always room for improvement) at building disabled places and accessibility, and it comes at a huge cost.
I am working on a projection mapping/documentary experience for an attraction and to build in subtitles, and the facility to do so is not cheap. To add the extra projector, create the subtitle files (AI helps, but it's not perfect). And to build the soft wear/hard wear to run it costs £3,000+ and that's for possibly <1% of your audience. Then factor in hearing loops, ramps and staff training. It all adds up. Not that I'm saying it's a bad thing, just I think the ticket price helps parks/attractions develop and adjust for people with needs. As a lad, I worked in Waitrose I had 2 hours + training a year on disabilities. (as did everyone) Think of the cost of this to a business like PP! By sharing 50% of the burden, the park can make the experience better for all.