Originally posted by Nerevar:

the hp bubble is currently beyond broken tough. this thing needs a nerf sooner or later. haveing a shield thats like nearly 3 times as strong as the best hp foods in the game is just not balanced in anyway. and you simply cannot balance future enemies around such numbers either.

It can be tuned at some point certainly, but damage received by the bubble isn't reduced by armor or resistances, so the comparison to health isn't entirely accurate.