Disagree on blocking them from responding. I think that this change to how the Reddit blocking feature worked was one of the largest errors Reddit made in recent years. Led to people in conversations disagreeing, one user making a statement and then blocking the other so that it looked like the blocking user would get the last word, which prevented the other from responding.
It's also useless to stop someone from doxing you, because they can just create another account and use that. The only way that it would be efficacious in that regard would be if the whole system worked via whitelisting users rather than blacklisting them.