No, all USB-C cables do not have hardware to negotiate power (voltage and current). USB-C is simply a connector type like USB-A and USB-B. What you’re referring to is called USB-PD. This is when the charger and device “handshake” to agree on the optimal voltage and current, then adjust dynamically as needed. Yes extensions can be a problem for things like laptops or anything that can draw large current over high voltage. It’s really not any different than trying to run a table saw over a cheap extension cord meant for a lamp or a set of Christmas lights. If you’re using one of the usb extension cables to charge your phone, it’s fine.