I do agree that monthly voluntary surveys is not an exceptional way for the general audience to have a clear idea on things are going on, but my point is less about the general audience and the responsibility weight Valve itself sit onto.

We can endlessly speculate on the secret/true data Valve is hiding from the general public, but in fact, only the actual public data affect their business: that's where publisher and developers make the strategic choices on which platform (OS) and hardware (VR HMD, highend GPU...) to support. Any incorrect or nonfactual data would lead to less sales, and less happy developer/publisher/customers.

Yes, of course Valve does have it's own "secret recipient data" they don't share... but I think the secret data is used more as sort of control on those who try to cheat the stats.

Sometime simplified Chinese language goes on top, resulting English language as secondary for the whole platform... quite often Valve fix those stats, no doubt by cross referencing their secret sauce.

That's how most modern anticheat in videogames works: the data is keep secret, until one special day you get one big wave that flush all them at once (if you throw constantly daily updated data on which kind of cheater you caught... the cheater got a precious feedback they can play onto)