I agree that new Sion is a better champion than old Sion. I do not agree that they couldn't have made something that at least keeps the feel of the old champion or any part of the old play style.
Keping the HP stacking was good. Keeping the exploding shield was fine, but they did not keep it in such a way as to make anybody who played old Sion happy. The only people who cared about it were the AP Sion players, and that was because it was a nuke. Their play style was completely destroyed, in that it is no longer able to be used as the key to success.
As for lore to kit comparisons, they did alright. Sure he is a big presence on the field, but he isn't an unstoppable murder machine of death. He is a mildly difficult to stop chunk of beef. If he was an actual Juggernaut of some sort he would realize that fantasy much more. If you let me use Sion's passive as the actual champion I would feel closer to the lore, but isn't that just a worse form of the old ult? Interesting.
At the end of the day, you aren't going to see it my way and I won't believe that the VGU was that good. I have been through this discussion many times before, I know that it never goes anywhere. I am done here unless you come up with something new.