Should we consider combat QOL improvements/changes ?

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Which you only see in raiding, not the game over all. And I'm talking flavor of the month stuff in xi that prevented players from leveling certain classes. Like when Treasures was released and blm was not welcome in colibri parties due to the reflect, and tanks not using food due to the fact they ate it. I also wasn't done editing my post. Instead of taking a small snip read everything in full please. I'm speaking of over all content like class leveling and story content not raiding. As these changes people propose effect leveling as well as raidin and also effects lore as well.

My original post was about the issue that our combat system is going to have to change at some point in the future because of reasons I've already listed multiple times. I used elemental strengths/weaknesses as a way to spice up the content and add some variety and differences, but it wasn't the full extent of the ideas I proposed (and really this discussion shouldn't be about what I proposed but rather what people think should happen to address this issue).

Classes and jobs can be redesigned to work with an elemental system (since that was the way it worked in 1.0 albeit it wasn't done very well and no improvements were ever made to it because 2.0 was being made). If you do some research into previous versions of this game, you will see that there still exists the capability to give us a more complex system than what we have now without needing to add more skill layers (for lack of a better term - explained in my original post).