There's a part of the game that's ONLY ACCESSIBLE if you heal yourself while walking on lava.
Technically you can remove the lava with the whirlwind spell, but I agree that the possibility to gain immunity should stay in the game, since alternative solutions to problems is one of the recurring themes in the game - and after the hotfix, the possibility does again exist - through spells and potions.
With the hot fix, isn't it back in? Between shield spells which I heard worked before the hot fix and now spells and potions once again allowing you to go past 100%, seems very liberal to me. Yo just can't have equipment do it alone now. If the game just shipped that way...