Prepatch was so much fun! I cruised Icecrown for hours.
The worst thing about the instantly melting rares and WB in ZM is that players are still trying to tag them to get flying. We have a player who came back to SL recently and even with a guild “taxi” service on 2-man mounts we couldn’t get him to the WB in time.
At this point getting flying requires installing add-ons to find and camp the spawn points of rares that don’t show up on the world map. That’s horrible game design.
Doesn’t sha spawn with 99% damage reduction for 5 seconds. All old world bosses should have this to allowtagging.
Today
Rare spawns
First to hit it kills it
That person loots it
With damage reduction buff
Rare spawns
99% damage reduction buff active
Everyone hits it for 
10 or something
1 minute passes and 20 people have hit it then the mob immediately dies when someone hits it for full damage.
Everyone who hit it gets to loot it
Doesn’t rares like Hulon spawn like every 10, or 15 minutes now? Thought they made old rares spawn faster. I guess with that horrible feature crz, it would still be tough to get a tag on the rare even with faster respawn times. Get rid of CRZ Blizz! You could always roll a toon on one of the many low pop rp realms also. Thats how I got the Thundering serpent mount from Timeless isle.
Huolon is not a world boss tho, its just a rare.
Just having them take 1 point of damage per hit for 20 seconds or so should be enough for everyone to tag it.
Do the following:
The failure of the RNG mount design going into later expansions.
I really would like to see something done to handle this and I like the idea of an immunity where tagging still counts. Another option would be to add a max damage they can take from one ability or turn each rare that drops a mount into a shared-progress area world quest or something.
One thing FFXIV does with its older content is the Fates system which are like WQs that scale you down to the level of the content, but they’re all still entirely soloable. I’d absolutely love to see something like that show up in WoW.