that problems that it creates are manyfold:
1. inventory space issues
2. characters flashing
3. it becomes the norm and people who don't want to do it are "gimped"
4. it's a bad design choice, the reason it was in XI was because of poor stats on gear (a good design choice would be to force players to think about the best gear for their style of play PRIOR to starting battle.)
5. it slows down the pace of battle