Originally Posted by
EdwinLi
The "replacing" part is actually a very dangerous zone they have set up into FF14 due to their rule of not allowing players to use skills above the level sync so any new skills designed to replace a old skill will not be able to be used in older content thus they can't really replace a old skill unless it is for the more current content only.
Unless they allow a skill that replace a certain skill to be used in a lower level area then the player is stuck with placing that skill into their skill bar incase they get into old content, forced to use only old skills, which SE tends to want players to return to older content to help newer players.
SE will need to allow the "Replace" skills to be used in older content or allow all skills to be used in older level sync content if they wish to remove the issue of too many skills in slots.