I never knew that USB-C extensions are not allowed for a reason

There is a reason for USB-C extensions not to be part of the standard. They can be bothersome in the best case and dangerous in the worst.

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I have a 240W extension from AliExpress, used with a 120W power for my laptop, it never gets hot even when using 100+W
- Because you made sure the cable is rated for more than what you're using it for. The problem is when somebody doesn't do that. A 60W cable hooked up to a 120W power supply, for example.
  
  My highest charger is 65W, that's enough.

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