Quote Originally Posted by Mesarthim View Post
You're not the first person to suggest this and at this point you won't be the last. I'll just repeat what others have said every other time this has been brought up:

"It isn't fun spamming more buttons to be equal to someone who only has access to a 2 button combo."

May or may not be paraphrasing. Then you open a new can of worms about people being rude to others because they don't have access to certain abilities etc something something. tl;dr There are flaws to your suggestion as "nice" as it sounds.
I can see it now, the can of worms you're referring to:

"Oh god the tank isn't synced so we're stuck with smaller pulls"
"The dps isn't synced, our aoe is going to suck"
"The healer isn't synced, they won't be able to handle big pulls"
"Ugh you're all synced, this is going to be so slow"

It would also be demoralising for some newer players to see others use abilities they have no access to from the same class. It could make them feel less powerful. And it could be confusing to them as well because a new player is likely to not know why they can't use Flare but the other blm can despite being the same lvl.

Never mind how higher lvl abilities would completely trivialise some mechanics in lower lvl content. Stuff that is supposed to kill you may not at all because you have access to abilities that far outpace the danger the instance is supposed to bring. This would result in instances feeling like entirely different content depending on how many players are synced or not. And it could also result in new players getting carried to the point that they are used to higher lvl players being able to do most of the work, and then get a huge shock when they end up in a party with no one synced.