Adding an ilvl sync to the level cap MSQ content of each expansion would help. Power creep between the beginning and ending end game gear for an expansion is huge.

If players were defeating Thordan at 145 and Shinryu at 285, putting the ilvl sync at 180 and 320 respectively would make those fights feel better than they do when players are synced to 270 or 400. There's still a little bit of power creep to help a party with a few first timers without making the encounters faceroll.

Since they included ilvl sync with the level 50 dungeon remakes, I'm hoping they plan to add them to the MSQ dungeons and trials of the later expansions during Dawntrail.