I think you misunderstand: lemmy’s new instance blocking feature that users can use only blocks posts from an instance, not users or their comments from that instance, which is what most people wanted the feature to do: block the toxic jerks from any particular instance along with their posts, comments, etc the same way defederation would. By only blocking their posts but allowing their comments, etc. to come through, the new feature is mostly useless, as it still requires users to be blocked individually.

Since Threads is an instance that has, rather than thousands or tens of thousands of users like a typical lemmy instance, but tens of millions, this makes things even more daunting for users of instances which don’t defederate from Threads.