The only thing I miss from reddit is the ability to use lemmy as a supplement to stack overflow. I still use teddit to occasionally find old posts on places like r/learnprogramming
I'm a junior web dev so I still benefit from old posts that answer basic questions, but I do wish I could just do a ddg lite search and be able to type in 'lemmy' and get the answer to my question.
Otherwise there's just certain subreddits I wish there was a corresponding community here on Lemmy like specific Indie Video Games. These are small issues and I hope Lemmy popularity grows. Not just for my personal wants, but just cuz I like decentralized alternatives as their simply more authentic imho.