My argument kinda relies on it.

Waking up at nine to do some light exercise with reggaeton at a mid level volume could easily wake up a person in another apartment.

So how on Earth would the person doing that know that it's bothering someone if they don't go and tell her?

Do you honestly think that if you had had a remote to your neighbours TV, it would've solved the issue? So when one of your devices suddenly turns off, you just go "oh well, guess I'm never watching TV again"? Or perhaps "oh the TV mysteriously turned off, that must mean that my neighbour is politely signaling I should lower the volume"?

I used to work night shifts, and a neighbour vacuuming at midday seriously pissed me off. Does that mean they were being unreasonable by not allowing me to sleep?

No. I asked her politely if she could vacuum later if there was nothing special she needed, and she agreed.

I know it's easy to demonise neighbours as assholes, and lots of them are. My current one's are fucking horrible, and I can't fucking take it much more. But I still have went over to try and talk about it, like an adult.

contract of keeping noise at a reasonable level knowing where you live for potential harassment reasons.

"What is an anonymous letter"