Why can't multi port USB chargers charge large devices on all ports at the same time?

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Why can't multi port USB chargers charge large devices on all ports at the same time?

Due to the uncertain charging current of mobile devices, from 20W mobile power supply to tens of Ma Bluetooth headset, we test the current commonly used mobile devices. Qc3.0 mobile phone is charged at the fast charging port with a maximum current of about 16W, such as LG G5; the mobile power supply supporting fast charging can be charged separately.

Larger ones, such as Zimi mobile power supply; tablet computers are mostly between 1.5-2a when charging on the ordinary smart port, and mobile phones are mostly between 1.5-1.7a when charging on the ordinary smart port, so we often calculate the profit according to 2.4a of each port.

This power level is chosen because it has the highest utilization ratio, i.e. the highest cost-benefit ratio.

If we want to achieve full power, there is little chance to use full power operation, which will cause waste of resources and high price.