I assume it's for people with eyesight issues / blind. At least that's what I read about it when it was introduced. However even then I have severe doubts in that helping (I also had a legal blind colleague and know how he got around).

So I don't really think it helps any amount of people weighing against (statistically) possible 1% of Autists that might have more trouble with it.

And yes you're right it seems some kind of default reaction by people to raise the voice, also for instance when I don't (and can't, and I told them beforehand!) understand in busy environments.

Thanks for your answer and perspective! I always think of 'you' when a regular stop in my home city casually states that all elevators at that stop are broken (for at least weeks) so you'll just have to take the next stop (... And then??).

Yes it probably makes a small dent in the environmental benefit, but uncomfortable public transit is an even bigger disadvantage because then people take cars instead.

Hardly though, right? You would have to lower it to like maybe 4 people per carriage to match typical car usage. Besides, increasing the number of trains running during peak can solve this.

I want full speed all the time, and loud enough that you can't really hear me trying to sing along. Don't really have the breath for a lot of the rap I attempt

C'mon you know what they meant. Obviously its a public place, but its one you've actively chosen to go to, to experience loud music. Thats different from going to a store to buy pants and they are blasting music.

...no. Of course not. It's a venue for an event, presumably with ticketing, not a public park or something.