the majority of players do not want this added, thus SE most likely will listen to the mass majority of the player base that does not want it then rather listen to the few palyers that do want it added. d lvling in XI sucked and was annoying, adding more fuel to the fire was how getting exp was a bit slow.
Now to kinda compromise with the ppl that want it added and the ones that dont, maybe SE can make you lose exp upon death but you will never actually d lvl. So you can die mutliple times until you lose all exp gained within that level but you can never go back to previous level. example you are at level 25 with 10k exp you keep dying from aggro mobs unitl all the exp is gone but you never will go back to level 24 with X amount of exp to level up to 25, you will be at level 25 with 0 exp within that level. maybe this could give players a kick in the ass like some ppl want, but like i said in eariler most ppl don t want anything that involes D lvling.