Say you sit down to play an FF game. Anyone one will do. It's the first time you've played this particular game and your very excited. You play through the game, collecting items and weapons, having new characters join your team, and learning more about the world as the main plot unravels before your very eyes. However, out of the eight or so characters that join your team, you probably only ever use four of them. The other four simply sit on the sidelines and watch quietly as their teammates slowly save the day from certain doom.
Why not sell them? You don't use Quina? I'm sure someplace could use a chef. Sell the teammate and get lots of gil for it. Fuck it, I'm sure Kuja could use her. Sell the it to him and make five times as much. This idea would work even better if you had slavery as an issue in the game. Sell your teammates into slavery for gil. Why not? Were you ever going to use them? Hahahaha
Why not sell them? You don't use Quina? I'm sure someplace could use a chef. Sell the teammate and get lots of gil for it. Fuck it, I'm sure Kuja could use her. Sell the it to him and make five times as much. This idea would work even better if you had slavery as an issue in the game. Sell your teammates into slavery for gil. Why not? Were you ever going to use them? Hahahaha

I rather just keep the ATB system and switch characters during in combat.