The dislike stems from two (and a half) reasons:

1) Push vs pull. As you identified, ls doesn't stop you from doing the thing you wanted to push the man page on you when you don't need/want it. ls just does the thing you ask. man also just does the thing you ask. The product tour is a sign that the developer doesn't understand consent and is trying to get the user to do what the developer wants, not what the user wants.

2) It's infantilizing. The product tour assumes the user doesn't know what they want, and doesn't know how to RTFM to learn how to do the thing they want to do. It treats the user as having no agency.

2.5) It's a tacit admission that TFM sucks and R-ing it isn't a productive use of your time.