Let me go dig up a comment I made on reddit a couple weeks back

Ok here it is. So basically, we'd hit 100 and reach our max level, as dictated by tradition from previous FF games. So we need a new way to 'level', but not with 'levels'. While the execution was debatable (Maw of Souls spam...) I really liked the 'idea' of the artifact weapons from Legion, over in WOW. The idea of building a talent tree, of having choice over your level up reward skill/traits, at a time when they had 'choose one of these 3 choices' once per 15 levels, was cool. And the tree was shaped in the outline of the weapon was a nice touch.

So I was thinking, why not have something like that, but instead of us empowering a weapon, we're 'writing our own memories' in the Soul Crystal, having learned everything it has to offer us? For example, I knocked together a DRG themed one. Note, that while you can choose which way through the tree you go, you'd have 10 points to spend, for the 10 'levels' you earn as you go through the expansion. Thus, while you might have differences between two DRGs who are still levelling, due to them making different choices of pathing, at max level you'd have the full tree filled out. There would be no 'you haven't taken the X talent? stop griefing, kick from party'.