Almost every client brief I get still has one.

5 slides with 5 different offers, auto rotating every 3 seconds.

By the time someone reads the headline it's already moved to the next one. & on mobile people just scroll past it anyway.

One clear offer up top does more work than 5 fighting for the same spot. Put the rest in a row right below it.

But try telling that to a client whose boss wants HIS product on slide 1 too..