Besides other factors mentioned in this thread, there's also
- selection bias: people with a positive view of Lemmy already migrated, so the leftover is bound to have more negative views
- older userbase: older people use language in a different way, talk about different topics, and dig into those topics in a different way. That often makes younger people throw a tantrum.
- group identity: for those "AS A SNOO" we're basically apostates.
- edit: personal drama between higher ups is more visible here than in Reddit.
I agree with you that both things have their upsides; and frankly, I don't even think that we should be pandering to the immigration leftover wallowing in Reddit. Growth is good, but growth should never come at the expense of the community that you're trying to grow.
However I feel like those points help to explain why the "lol lmao" crowds hate this place.