Imagine a hypothetical situation where I have beef with you. I create a second account and block you. I use this account to scout your posts, then using that other account, I go to all of the posts you’re commenting on, and post comments calling you out for being… I don’t know, whatever nasty thing I want to call you out for. Because that account has blocked you, you can’t see those posts (and presumably not the replies to them, either), and can’t defend yourself.
What problem have we solved?
To be clear I’m not saying it’s a solution, just that the proposed solution isn’t actually one, either. At the end of the day, it’s not possible to both do what OP is asking for and not also make block lists public, so it’s all academic at this point.