Export data in format CSV or JSON readable and importable from other password managers
Currently, if I export my data from ProtonPass, for example, in CSV format, I cannot import it into other password managers like Strongbox, KeepassXC, or Bitwarden. That's because the username login data is in the "email" field instead of the "username" one as it should be.
Thus, Bitwarden, for example (but it's the same for the password as mentioned above managers), leaves the username field empty after the import, and it's not possible to intervene on the single fields before the import process ends.
It's not a matter of leaving the pain to other password manager developers, who should allow users to modify the fields during the import process, but it should be a reason based on coherence. I think it's coherent to consider the field "email" differently from "username," although sometimes the first one is the username.