The reason why USB-C (with Power Delivery) is connected to fast charging with phones is that it allows more power to be transferred via cable than previous USB

The reason why USB-C (with Power Delivery) is connected to fast charging with phones is that it allows more power to be transferred via cable than previous USB charging standards. For Notebooks this is not necessarily true, as there was no limitation for power delivered to the notebook before. What you have to consider with fast charging is that it degrades the batteries faster and produces more heat.