Not everyone learns the same way. Players who learn from watching videos are quite common. There are other players who cannot get anything from watching videos.

A number of players choose to go into each encounter unspoiled, as if it were the first day of the patch where that encounter was introduced when there were exactly zero video guides.

You may be asking such player to forgo the experience in order to make your roulettes easier.

I assume you are talking about roulettes, as party finder provides ample opportunity to both screen players and reasonably kick them (if it is not advertised as a 'learning' PF)

I agree that there might be a small minority of people who are looking for a carried clear but be very absolutely sure that the player in question is just not getting it or expecting a carry. Other reasons for miscommunication include second languages, PlayStation without a keyboard, and the player is simply not equipped or experienced enough for the encounter. Encourage those players to join a learning PF and then either vote to kick or abandon.