What’s an obvious software product that could be 10x better if approached fresh and with craft?

e.g., what Linear did for software development or Slack once did for office messaging

Anki. Amazing tool, obviously works, just needs a better UI 

https://senrigan.io/blog/chasing-10x-leveraging-a-poor-memory-in-software-engineering/

So true, Anki is a great concept but the user experience is poor. They don't have to go full duolingo with cartoons and achievements, but make it look and behave like a mainstream app and it will rule