I'm not a 100% certain of the rules on blessings (I haven't bought ToB yet), but isn't there any kind of drawback to using blessings? What are the bane/chaos star outcomes for the healing blessings? If you assume that an "infinite" amount of blessings can be cast in story mode, you will also have to accept an "inifinite" amount of banes/chaos stars. This makes it completely impossible for a wizard to use any kind of spells in that fashion, miscasts is a real risk. As I said, I don't really know what the negative outcomes are on the blessings but I'm sure there is something?
I really don't think this is a serious issue, it's very easy for the GM to step in and decide how often the blessings (or any actions for that matter) can be used in story mode. Even a new GM will have to learn how to scale challenges properly, this is just one part of it. If a player has an excellent RP reason to use actions in story mode, I would let them do it, otherwise I'd probably keep actions to encounters only.
Essentially, this game cannot be played without house ruling some important stuff at the moment. This is not acceptable. I can run/play any other modern game that comes to mind "out of the box" without any sort of house rules. At the moment, this game requires them.
I think you are exaggerating a lot. The game can be played perfectly well without any house rules. There isn't a single RPG game that can be played without a GM to interpret rules and NPC behaviour. Games that don't require this are not RPGs in my opinion.
edit: bah I give up, how do you quote posts in this weird forum?