Adequate PSU

Hi

PSU output is quite often at a higher voltage than many components on the board can tolerate.

Good Main Board design used to incorporate large capacitors to manage any sudden surge type power needs.

So if your PSU delivers 90 watts at 18 volts, that is 5 amps.

A CPU taking 55 watts, if your CPU runs at 2.5 volts, that is 22 amps.

The above values do seem inconsistent.

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You are not comparing like with like, however manufacturers wont over specify because of extra costs in manufacturing.  For the majority of users the PSU supplied is adequate.

I see the price difference between 65W and 90W USB-C power bricks to be negligible. I simply have a 135W model which with an adapter can run most laptops.

My PSU is rated at 20V 6.75A, 15V 3A, 9V 3A, 5V 3A

According to the USB IF standard PD 2.0 calls for a very fine level of granularity in voltage at up to 5A, The six fixed voltages are actually deprecated,

Revision 3.1 adds Extended Power Range (EPR) mode which allows higher voltages of 28, 36, and 48 V, providing up to 240 W of power (48 V at 5 A), and the "Adjustable Voltage Supply" (AVS) protocol which allows specifying the voltage from a range of 15 to 48 V in 100 mV steps.

My Lenovo 135W power from the sticker.,

The Apple 140W PSU uses 28V 5A to run their machines. My Lenovo PSU seems to top out at 20V but it has more current capacity which exceeds the standard a tad,.

Mobile phone charging eventually was standardized when Apple iPhone 15 emerged with USB-C. USB power banks tend to be behind the curve as most I see have a micro-c connector that limits power flow.

The latest standard nhas New 28V, 36V, and 48V  fixed voltages enable up to 140W, 180W and 240W power levels, respectively.

Hi

Your reference to Apple .....

https://www.bbc.co.uk/news/technology-58665809

Manufacturers will be forced to create a universal charging solution for phones and small electronic devices, under a new rule proposed by the European Commission (EC).

The aim is to reduce waste by encouraging consumers to re-use existing chargers when buying a new device.

All smartphones sold in the EU must have USB-C chargers, the proposal said.

Apple has warned such a move would harm innovation.

The tech giant is the main manufacturer of smartphones using a custom charging port, as its iPhone series uses an Apple-made "Lightning" connector.

"We remain concerned that strict regulation mandating just one type of connector stifles innovation rather than encouraging it, which in turn will harm consumers in Europe and around the world," the firm told the BBC.

Apple moved to USB-C with the iPhone 15 and the iPad lineup also has moved to USB-C except for some older models that are still not modernized

USB PD has been around for a decade plus but corporations thumb their nose