Earlier quoted context omitted.
work-inbox-21.5k gmail-inbox-49.5k i cant imagine interacting, sorting, and deleting all those items. search works perfectly every time, never been unable to find a work email. i also cant imagine using email as a todo list over some kind of team/projectmanagement inbox software such as https://www.enchant.com/ , frontapp, intercom, missive, zendeskinbox, streak, trello, asana etc.
So, do you just track read-unread? Every email that is read has been pushed to a task management system? I know a lot of people with horrifically stuffed inboxes and I only consider one of them organized - the rest are prone to miss emails, or forget to do whatever they were asked because they read it and then it was in a giant bucket of unimportant stuff.
talking to the developers, thats not exactly how they intended the software to be used, and internally they close tickets aggressively and move longer term tasks to project management tracking in trello.
on the gmail front, their tabs or whatever are a lifesaver. i only check the primary and update tabs daily, the rest is pseudo-junkmail.
tldr: to answer your question simply. if i get an email asking for something or that i need to act on, and it didnt come FROM some type of tracking/pm/ticketing software, i forward it to the appropriate software so it is added to the todo list. if youre on a team using task software like https://glip.com/ for instance, you add the task directly in the software, you dont email the person.