People? The majority?
Pep wouldn't be so successful if he followed the majority. You don't manage a professional team, let alone one of the best teams in the world, by consulting the majority. I doubt the majority was happy with Pep's tactics back in 16/17. It was just several months ago when the majority wanted Gundogan and Mahrez out and couldn't stand Rodri.
Let's use our brains and try to understand better why Pep rotates heavily. Let's not regurgitate clichés ("final!", "trophy!", "Use your best team!", etc.), but try to see things in their proper context, that is, that the CL is a firm priority. We have won the league cup many times, but haven't played a CL final. Doing better in the CL is more important for the future of the club, at least for the owner, the club bosses, the manager, and the players, than winning another league cup.
Pep is going to prioritise the CL and the PL. A PL/CL double after the domestic treble would be fantastic and would cement this team as one of the greatest (English teams) of all time. A treble, let alone a quadruple, would be even better, but the physical and mental resources of the team are finite and should be managed cleverly.
Nothing guarantees that if we play our best team on Sunday we will win, and nothing guarantees that if we don't play our best team on Sunday, we will win in Paris. It's about probabilities: if we rest players on Sunday, they are likelier to be fresh and injury free in Paris, i.e., they are likelier to get a good result in Paris. And, at the same time, the squad players will feel valuable to the team if selected to play in a final, it's highly important to have a happy squad when you play for the biggest trophies.
Time will tell, Pep may play our most in form players on Sunday, who knows? Personally, I would be very surprised. At the same time, I wouldn't be surprised, if the squad players play well and win the cup.