The only reason why we all used third party apps for Reddit, is because their app and website is abhorrent trash. It’s great to have a choice, but Lemmy’s website is smooth to use. I know it’s mind blowing not to use a app for everything in 2023 but Lemmy just works.
No, Slide for Reddit filled a different spot than old.reddit with RES. Apps can put less load on server instances, too.