It's not too much of an ask in terms of space, in this particular loo there's more than enough room to accommodate a smaller toilet and lower sink.
And like I said, the sink is set back into a work top so yes, I do lift him up where I need to wash his hands but as I said, the water is so bloody hot I can't let him wash them.
I don't massively think it's self centred, it's not like I am in a minority having a toddler. I don't expect the world to revolve around us, but now I am a parent I have simply observed where there could be more consideration.
I can certainly see how using facilities with a disabled child or adult would be impossible in lots of situations.
I guess when it comes to parks it's just my local area that they're crap. I have chatted with other parents around about it and they share my thoughts on that element. Again, I don't expect a park to be just for young children, they could all be more inclusive. For example, high apparatus not having open sides so they can't fall off. Sand pits, sunk in trampolines - all things I've seen in other places that work lovely for all ages. There's a park about a 25 min drive away that has these things, plus some really big/wide seesaws, roundabouts, etc. It's a great park so it makes me wish some of those elements were introduced when they build new parks in my local area.