Well, this is a war game, not an RPG. You have to approach it from the standpoint that everything you have is expendable, *especially* in multiplayer where your enemies will go to great lengths to cripple your stuff. So from a game standpoint, the fact that faerie queens are available to remove afflictions is almost irrelevant, because the cost involved is so high that it's almost always a better deal to just make new stuff to replace the injured.
I agree that they should add an effect code that lets you remove horrormarking and/or curses, even if they never use it themselves. But it's hardly a high priority because it just doesn't matter that much.
Losing your pretender is not that bad an outcome, actually. Especially in the late game. It's also likely to happen whether or not you get horrormarked, at least in multiplayer, because your opponents are going to be devoted to doing you in
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You can also just raise pretenders from the dead repeatedly by prayer.
In multiplayer, curses and horrormarking are aspects of a strategy that would be unviable if they were easy to remove - and their effects are such that if there were ways to remove them that were very difficult, they'd almost never be worth it.