I agree.. I have a 20100 usb-c, and when I try to charge and use my MacBook simultaneously, it doesn’t actually charge, it merely slows down how fast the battery drains. I actually have put the MacBook to sleep or shutdown to charge, and that in itself will take a few hours..
The new 20000 speed looks to remedy that, but I honestly don’t like only one usb-a port. Not a sacrifice I would make. Being able to charge up 2 cell phones at average speed and slowly juice my MacBook all at the same time is pretty convenient.