Hi, Sam. Here’s my thinking on whether to keep or remove the option to choose which words to save. I decided against it for an important reason I call “two separate stages: fun and learning.”
Imagine you’re playing a game in your target language (or consuming other content). During this first “fun” stage, your main goal is enjoyment, so you’ll mostly be looking up words you don’t know. Lookupper’s approach is to simply save all the words you look up in bulk, so you can have fun without thinking about which words you need to memorize. You can enjoy the experience without constantly having to decide which words to keep and which not to keep, which would disrupt the flow and likely make you tired of the game.
After you finish playing—not immediately, but whenever you feel ready—you enter the “learning” stage. At that point, you can review the saved words one by one, removing those you don’t want to include in your vocabulary. Then, you can either export the words you’d like to memorize or keep them in Lookupper’s saved words for future review if you’re not into spaced repetition tools.
I might be wrong in thinking that the “fun and learning” approach is the best, and I’d be interested to hear your arguments.