[Workaccount2]

Since I actually work in this field:

Redundant switching power supplies are purpose built to be redundant. They usually have a current share circuit (to balance the load) and output diodes (to stop one supply from feeding the other one). Without that one supply will "over power" the other, fill it's output caps, and then the feedback of that supply will go "Hey the output caps are charged so why do I need to do anything!?". You end up with an erosion of power balance.

You are riding a pretty high horse, but the commenters in that thread are not wrong and if you think cheap 5V USB chargers are anything like redundant server PSU's. I don't think putting random USB chargers in parallel will cause a fire or anything, but it's just needlessly bad engineering that will be anything but robust.

A programming analogy to help people here: You can write a program that is tens of thousands of lines of if statements. It might probably work maybe for some inputs? But damn if it not bad engineering. No one would ride around on the high horse of "See the program worked! The "experts" were wrong!".

[NavinF]

The linked post shows why all that is unnecessary. Paralleling PSUs is so easy that people get it working by accident.

> You end up with an erosion of power balance

Unlike you, the guy powering his PC with two USB-C ports quantified how imbalanced it is. 65W+75W in his photo.

>tens of thousands of lines of if statements

Terrible example because that takes more work than the correct solution. btw the correct solution in this case involves FETs, not diodes. Look up "ideal diode circuit"