First of all, it would never be applied to all of Lemmy, that wouldn't make sense and isn't really possible considering how federation works.

Second, automoderation is a necessary tool to deal with a flood of users on many subreddits, and it belongs in place. Each community has to make its own decisions about how best to moderate, but without automated tools they're just going to drown. The net effect then would either be to shut down the community or allow the community to exist with no moderation at all.

You do. not. want communities here with no moderation at all.

Encourage communities to use tools that are sane and give you options for interacting with the community, and which don't harshly penalize you for small issues with your posts, but what you are de facto asking for in this post is chaos for any large community.