Ask HN: Those who left Gmail behind, how do you live without bundling?

I switched from Gmail to FastMail last year and loved it, but fell way behind on my email. I've realized that the way Gmail separates promotional, social, updates, and forums has a _huge_ impact on my ability to stay on top of my inbox. I'm really surprised it doesn't come up more often when discussing FastMail/ProtonMail etc. Am I missing something? How do you live without that feature? Do I just get more email than most, or is there some other workflow I don't know about?