system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: two-in-one shampoo/conditioners

How do these products work? Don't shampoos strip oils and conditioners put them back in?
gpt
Yes you are correct shampoos will strip away the oils in the conditioner.  Sometimes these products will contain oils that the shampoo won't strip away, but they wont condition your hair as well.

Basically you are right, they are a scam (mostly).  You are always better off shampooing, THEN conditioning.