I don't understand why you keep comparing this idea to jin and isen because they have never once made a lvl 99 cap server. When the game had the most players of all time they had a choice to make either make the 3/4 of the playerbase happy by adding new costumes new mounts and new dungeons etc or make the 1/4 of the player base happy by adding upgrades and one after another crazy increased stats items we can see which one they chose.
Just like the video I linked said that's happen to many of games the new game enhancements did exactly what the name says it enhanced the player base all the way to a new game. To me if the game isn't broke DONT change it in the first place. Apparently im not the only one who thinks this where is incursion or esoteric or JBI (just bring it) and countless of players.