I see this as a huge problem mostly when the game first comes out. When the beta first comes out, it was pretty bad, obviously. I am leveling a forever character right now and don’t really have much of a problem with this. I can get mobs and do quests just fine.
Ultimately this is a version of classic, not necessarily vanilla, but is catering towards that classic crowd. They mention this heavily in the announcements and interviews.
It’s just change should not be rushed. I don’t really think shared tagging is the solution for this specific game just in my personal opinion, but it doesn’t hurt to consider options as the game matures more.