Users who don't have that option essentially find themselves somewhat isolated in long-thread conversations.
I have some experience with this because I use multiple clients. There is a huge difference between Amethyst and Damus notifications, more than many people realize.
Although I wouldn't say it was censorship because I understood the intention, making it optional is a step in the right direction in my opinion. And I must say, I love your philosophy as a whole.
I think damus should definitely still have amethyst style filtering as an option, outright muting the thread is a bit heavy handed.