Same for the other kinds of stool. More than a few phlebotomists would be quite concerned about sitting on a stool and having it start bleeding under them, or seeing stools in a blood sample.

I think part of it is also that Star Trek is hampered by its own branding. No network would want to risk their cash cow by having them be controversial, so they’ll keep it safe.

I have quite a hard time envisioning any new Star Trek nearly getting the show taken off of the air by pushing boundaries like the original Star Trek did.