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.
Reddit didn’t technically kill all api usage, they just killed the ability for major 3rd party api users to do it for free. You can still get your own personal api key and use it for stuff. People have made patches for all the popular android apps to substitute your personal key for the app’s usual key.