I don't like negativity, but I do take photos of people doing their routines sometimes.
Usually just artistically. Or because said random person took a pic of me and I'm getting my revenge.
Just last week I was taking a picture of a man and his two kids playing in the shallow waters at Elbow falls. The kids were just so cute and it was natural and not posed. The smiles were real as the girl pointed out something cool in the pool. I deleted them afterwards because they were awful shots (my fault not theirs), but I did take them.
I got that from my mum too. We do it to get natural poses at different angles, for showing us foreshadowing, etc. But we also don't sell our photography, so I think that makes a difference.