Of the two different things I used Reddit for, Lemmy is a 100% replacement for one, but sadly lacking in the other.
Current events (news, politics, etc…) the transition to Lemmy was seamless.
Tech Support on specific niche software (kdenlive, Scribus, Gimp, etc…) is still lacking. there aren’t a lot of communities dedicated to specific hobbies where a person can ask and answer questions from other users.
In regards to #1, there is actually one area where Lemmy has an advantage in my case. Because my local instance is my country instance, having that third “local” option means that I can, without any searching, keep up to date on national current events as well.
it’s like being in a Canada only news site, and then if I want, I can hit “all” and see the rest of it. it’s super easy in a way that Reddit couldn’t be.