USBC (at least in its current form) likely can’t provide enough power to run most tools well also. According to what I can find for Ryobi tools (as an example) they’re rated to pull 10x the Ah rating in A continuously. That means a typical 4 Ah battery can deliver up to 40 A at 18V or 720 W continuously. I’d guess tools pull 400-600 W continuously, and may be up to 25x on start up or stall for a few seconds before the BMS cuts the tool off. USBC maxes at 240W right now. For reference - that’s about half of what a typical NA wall socket can deliver at 120V/15A.
Using USBC to charge batteries is fine but we don’t appreciate just how much energy can be delivered by batteries and how quickly.
You’d have to have something that can deliver that peak amperage without catching fire, and the wiring to handle it too.
In my case it’s that hard separation between devices. I like reading on the eink screen compared to the phone screen, and there are no notifications to interrupt me. It helps too that the ereader is just ready to use, no decision to fight about what app to open. I tightly manage notifications only phone and it’s still too much of a draw to go doomscroll instead of read. I frequently pull just the reader out and leave the phone so I just use the magnetic attachment to keep them together.