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> This is not really true... Some laptops maybe... Lenovo had a square one

The exact shape of the port is clearly not the point of their statement. It is that you had specific, one use, variations of chargers that only worked for one laptop and were trashed when you got something new and were very difficult to get a replacement or additional charger for. Whether they were barrel or square isn’t the point.

> If they buy a custom charger for their laptop, they won't use it to charge their phone, because they know their phone charger won't charge their laptop, even though everything fits.

But most people handled it fine if they had a tablet, phone, and a few other random devices with micro USB. For the average person, moving to the semi standard micro USB was a net win, even though some people would try trickle charging their phones with old, low power usb chargers. Just because grandma can’t figure out what she is doing, doesn’t mean the actual average user won’t quickly figure out that their USB-C charger will work for anything less what the charger was rated for. Your laptop charger will charge your tablet, phone, and extras like headphones. Your tablet charger will charge your phone and headphones, etc. that is a good enough solution for most people, and simple enough most people will be fine. Knowing you can travel with 4-5 USB-C devices and only bring your laptop charger to charge everything is much better.