What would a block feature do differently than a mute? It's not possible to block someone from engaging with your notes, you can only "mute" them (filter their notes out so you don't have to see them)
Discussion
I think Muting someone is ‘hiding someone from my Note’
But blocking someone is ‘completely removing from my Note’
By muting someone, u can see him/her in some way, but not in blocking. That’s what I thought, maybe I am wrong
I think clients today usually use the mute for what you describe as block but maybe it could be possible to do a "softer" mute as well? That'll be up to the awesome client devs to figure out