>>12636636
Having enzymes to digest milk after you are a child is a sign of strength and versatility. Imagine having a media player that could only play mp3, mp4, and ogg - no webm, no mkv, etc. If humans had enzymes or biological mechanisms to gain nutrients from other things that they currently cannot derive nutrients from (like cellulose or visible light) then they would be even more powerful.
Be a part of the milk-drinking photosynthetic master race.