12 emeralds is still a lot and the fact that you could sit on mid for that long, means the opposite are not really smart/goodPersonally I think that everything is somewhat okay, I have a little disagreement with stuff like pearls being less, but I think the biggest issue is probably the emerald Sharpness VIII Sword/Axe which I really think are game breaking and a big mistake. You can just rush the mid get 12 emeralds and there it goes lol, you can pretty much obliterate anyone with such sword and it will make armor break much faster so it is unbalanced, they shouldn't have gone beyond the limits of the game itself. Sharpness VIII is just broken.
so then it's not worth to go for 12 emeralds and you can just win with your full iron and 12 dia sword.
It's also doesn't make you invincible, your good sword.