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The cables should have a ss or ss 10 or ss 20 label on them. The end devices should too I believe.

Apple cables and ports have no logos on them whatsoever. Just plain white/silver if metal.

Fair enough. But their USB-C cables and chargers do not:

That's because it's a USB Type-C cable that can handle only USB protocol. Thunderbolt 3 ones do have a logo on them [1].

Though, I do agree, having clear information directly on a USB Type-C cable on which features are supported would be much appreciated.

That's not a USB-C cable.

All OP said was that their cables don’t have icons. He/She didn’t specify just USB

"should"

The USB logo on usb1.0 cable should be printed on the "upper" side. How many times did you inserted it the wrong way?

The spec also mandates the orientation of the connector (socket) side but many manufactures have ignored that too.

Exactly. Without a qualification test, nobody would pay attention to those detail.