it is disappointing to see the intelligence not there for all devices, it is not difficult, Anker could easily do.
You have numbered ports. The power is periodically turned off all ports, then port 1 is enabled and allowed to take all the power it needs. Then port 2. Then if multiple ports then the 3rd etc.
You’d then plug your laptop into port 1 and say your buds port 2, and Powercore port 3
As it wastes energy to recharge a battery from a battery, devices like laptops need to get all they want. Buds need a small power for a long time. Any spare power budget goes to Powercore.
This 30/30 split is dumb, it means say a laptop wanting 45W will only get 30W, while say a phone needing only 10W is given 30W so you’re only using 40W of 60W.
My method would get all power used, to all types of devices.
Manual altering power won’t work well, as a laptop recharges, it later drops it’s needs and so you’d want automatically use released power to other ports.