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There were some higher profile products that left this out like the original revisions of the raspberry pi 4.

Raspberry Pi 4 had a slightly different problem - they attempted to get away with using just one resistor instead of two, as it allowed them to simplify their voltage-sensing circuit a bit. At a cost of non-compliance and all the issues that came with it, of course, so not a great bet after all.

So it wouldn't work on a pi then?

It would, but it would make the Pi not able to check the power capability of the source.

Note that the Pi's failure mode is different - it does work with C-to-C cables as long as they don't contain e-markers. They tried to be clever and it backfired.

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