1) The time it takes to make cards. RemNote allows you to take Notion-style block notes and quickly turn bullet points into flashcards using symbols. For example, you might be in class and make a bullet point in the format
- The quick brown fox jumps over >> the lazy dog
which you can later review as a flashcard that is automatically separated front/back by the >>.
2) The old and unintuitive UI - again, basically just Notion with flashcards. You can easily view all your notes in a bullet hierarchy and then switch over to SR flashcard practice. Even has rich code blocks, image occlusion, tables etc. A much better implementation of Anki's notes/cards metaphor in my opinion.
I am not sponsored by RemNote, just a university student who has bounced off Anki and really likes the app.