RPi is an interesting datapoint for the OSHW zealots.
Indeed, it's a very interesting case, it would be worth some historical/cultural research.
Raspberry Pi has
absolutely nothing to do with open-source hardware, never did. The Raspi foundation are not even claiming that, it would be ridiculous. Quite the opposite, they use things like DRMs to close their product down. If anything, Raspi is
the polar opposite of OSHW.
I do have an impression (but don't have the proof) that they originally did the guerilla marketing for the first model by injecting rumors about a new OSHW computer. This tactic was great, of course; the phrase still lives after a decade, and you don't need to
actively lie, at least not using your own name.
Raspberry Pi Foundation has "blood" in their hands, they are partially responsible for destroying the concept of OSHW. Back in maybe 2005'ish, the word did have some meaning. Now "open source hardware" is nothing else but a marketing buzzword completely empty of any meaning, can be applied to any totally closed hardware product.
Basic IO pin mapping is not a schematic, it has to be provided for any embedded device to be useful, of course. So by using terminology like this, they are still actively lying.
Raspi4 is great news, we are offering the possibility of using either Raspi3 or Odroid XU4 in an embedded thing which requires quite some oomph to run its software. The idea was to both prevent vendor-lock-in, and to offer two different performance options at different prices. Now it seems the gap between them almost closes, so both options can offer almost the same performance. The only issue left is the SD card (Odroid has EMMC).
Why is this topic in the microcontroller section? We now have the very specific section for Raspberry Pi exactly.