these catalogues are being compiled for the pleasure it gives the researcher/cataloguer and shared with others via the net in the hope that they will be of some interest/usefulness.
I have no problem with that at all, and entirely understand the situation!
As soon as I see a composer wrote no operas or vocal music, I usually pass them by ;) My interest in the song repertoire is connected with the poetry as much as the music. For example Medtner -living in poverty in emigration, but safe from the fist of the Kremlin - set a good number of poets who were banned, or excluded from publication, under the soviet government. There are very few musical settings of fine poets like Balmont, Akhmatova, Blok, or Gumilev - so they're worth hearing, when we get the chance :)