I had also requested this feature separately; sorry I hadn’t noticed this current earlier thread.
As far as I see it there are a few problems with the current bit depth/sample rate display in in Roon. The main one is that the bit depth/sample rate indicator gives the bit depth/sample rate for every format except for 16/44, where it says “CD” (in the album selection view). I would agree with what is discussed above, that this is misleading as it suggests that the music has come from a CD, which it may not have done. It’s also an inconsistent approach.
The second related issue, what @Derek_Morais has hinted at, is that a “source” metadata option is missing from Roon. Users should be able to specify whether the album source is CD, vinyl, web, cassette, Tidal, etc etc, with this shown along with the bit depth/sample rate. You can add these as tags but that is not as slick. Contrary to what some users above seem to believe, source and bit depth/sample rate are not the same thing.