I have a personal inbox (Fastmail), three Google Suites/Apps for various companies I'm involved with, a personal Gmail (for mostly spam). That does not include any chats (mostly personal, but also some work: WhatsApp for 90%, Telegram for ~7%, Signal for 3%), then there are three slack workspaces and a Matrix/Element to keep track of. And I guess there's Twitter/LinkedIn/Facebook for misc personal/work stuff (less critical, but do get messages on there).

I would pay money for an app that combines all of this (and works) like Element One or Beeper (problem is that Signal Bridge on Element has caused a ton of problems/bugs, and I heard of reports of people's Telegram account getting banned using Element One).