Proton apps are very janky in comparison. For example:

  You open Proton Mail.

  You'd like to read the second email in your inbox so you hit J a couple times.

  Nothing happens.

  J/K don't work unless an email is already selected so you use your mouse instead.

  You hit T to move the email to the trash.

  You'd like to read the next email so you hit J.

  Nothing happens.

  Hitting T didn't leave you with a selected email so J/K don't work.