Almost everything about it needs to be optional because sometimes USB is used to charge some cheap battery powered thing and sometimes it’s used to make a backup of a harddrive and sometimes it’s charging my laptop with enough power for it to be rendering video but still have a net charge increase to the battery while also providing Ethernet, video output, and keyboard/mouse input over the same one port.
EDIT to make it more clear why the variability of USB standards is what it is, compare a modern laptop to one from 10 years ago.
The older laptop has:
for video, an HDMI port (or the less common mini HDMI port), and perhaps a mini DP port
an Ethernet port
a charging plug
possibly some FireWire ports (may or may not be the same as the mini DP port)
USB A ports for keyboard/mouse and other random devices
The newer laptop has:
USBC ports that can do all of the above
The perhiperals, however, don’t support all of the features. They only support the features they actually use. As long as the laptop supports all of the optional features, you don’t need to worry about it.
The is especially helpful for less technical users who may not want to know what the difference between HDMI and DisplayPort is. With a fully USBC based laptop and USBC perhipals you can just plug it in and it will work.
Of course this is all dependent on the laptop implementing all of the extra features, which is still only really true of more expensive laptops.
People do not want to be limited to 1m long cords or only have thick and stiff Thunderbolt3 cords with 20 different conductors for a wired mouse.
Minimum specs like you are proposing just make the standard less useful and would lead to more competing specs that aren’t compatible at all (a la lightning cables).
To be a truly “universal” spec, flexibility is king.
Maybe optional opt out? Like to say you are usb-4 you have to have this format and support all of these features. Other you are USB 4 W/O x,y,z,PD,Video,etc. I also think PD levels should be labeled on power sources and sinks.
Almost everything about it needs to be optional because sometimes USB is used to charge some cheap battery powered thing and sometimes it’s used to make a backup of a harddrive and sometimes it’s charging my laptop with enough power for it to be rendering video but still have a net charge increase to the battery while also providing Ethernet, video output, and keyboard/mouse input over the same one port.
EDIT to make it more clear why the variability of USB standards is what it is, compare a modern laptop to one from 10 years ago.
The older laptop has:
The newer laptop has:
The perhiperals, however, don’t support all of the features. They only support the features they actually use. As long as the laptop supports all of the optional features, you don’t need to worry about it.
The is especially helpful for less technical users who may not want to know what the difference between HDMI and DisplayPort is. With a fully USBC based laptop and USBC perhipals you can just plug it in and it will work.
Of course this is all dependent on the laptop implementing all of the extra features, which is still only really true of more expensive laptops.
There should be a way to make it simpler.
Idk, something like “for USB 4 you NEED all of these”.
Or maybe USB 4 with levels like bronze, silver, etc.
Or make displaying data rate, display and charging capabilities all mandatory on all ports…
I’m not sure what, but “it’s a USB port; look in the manual and if you’re lucky you might learn what it does exactly” ain’t it.
People do not want to be limited to 1m long cords or only have thick and stiff Thunderbolt3 cords with 20 different conductors for a wired mouse.
Minimum specs like you are proposing just make the standard less useful and would lead to more competing specs that aren’t compatible at all (a la lightning cables).
To be a truly “universal” spec, flexibility is king.
Maybe optional opt out? Like to say you are usb-4 you have to have this format and support all of these features. Other you are USB 4 W/O x,y,z,PD,Video,etc. I also think PD levels should be labeled on power sources and sinks.