As a hobbyist, this sucks so much. With PCB manufacturing reliable enough for high speed signalling being affordable and hackerspaces with soldering ovens in every major cities (and there was some startup - in NYC I believe - that you could give Eagle files and a product order list and they would buy you the components at Digikey and manufacture the board for you... anyone remember their name?!), it really really sucks that all the interesting stuff is hidden beyond such obscure walls.

You won't even find Intel Thunderbolt datasheets on obscure Chinese sites. Wtf? And then Intel complains about why people aren't adopting it?

I agree that the categorization can be a bit tricky at times, but once you're used to it it's not terrible.