Yes I do, because while I dont think servers should force a block list on a user I do think the user should have the option to block and an easy path to do so if thats what they want. If there is a user that wants low-moderated instances blocked they should have that choice and easy access to a block list to accomplish it.
I myself dont use the block list, but I do understand its need for some users.
It is also an attempt to address the usability issue I mentioned earlier while not needing to block at the instance level... a possible middle ground solution.