As much as I like the wholesomeness of the concepts of upvotes only, I’d love to downvote idiots on other instances
What would be useful is if Lemmy had some way to allow communities to set if downvotes are allowed or not
Agreed here. On Reddit, some communities use downvotes very effectively as “this information is incorrect” so that mods don’t have to remove disinformation all the time. Others it turns into a popularity contest, which isn’t great.