I dont like unsync myself , but its a small percent of people that even do current endgame content, so the number of those whom wana do old content sync is even smaller, but to those new players that come along that want to experience the whole game. Many will just go with what the norm is (unsync) just because its literally the only option available to them to do this content. I had a newbie in nn wana do sync coil, I was only mentor to offer to help him sync it and thats because I myself never was able to do coil sync and refused to do it unsync.
This is just how things go and sadly its nothing we can do about it, nothing is gona change, unsync is the norm and is here to stay and each expansion every new player will end up going from easy dungeons to doing their first ex primal and possibly getting discouraged because the challenge from dungeon to primal is pretty significant. The only way this would change is if the player base decided to do content sync which thats not gona happen so just one of those things people have to deal with.