Would you propose adding every programming language with a Wikipedia entry to the whole code catalog? There are so many PL projects out there, and most of them are just abandoned experiments. I used to spend a lot of time looking into all this niche languages, and all I learnt was "people like making languages". The languages themselves typically weren't very interesting or enlightening. Many of them were incomplete and undocumented, or even completely broken (the only working part was the webpage).