There are simply some communities I can’t find on Lemmy. For example, I use subreddits based on admissions to specific colleges that would never be able to function on Lemmy due to its size. I’d much prefer to abandon Reddit altogether but the information I need is usually only there.
There’s a decent reader for Reddit via RSS feeds on fdroid called Geddit. I use it to browse some porn and also certain discussions, but of course you can’t interact with RSS so it’s just for observing.