Silver Bokoblins are unstoppable

I've been playing this game for months now, and no matter how many heart containers I have or how upgraded my armor is the silver variants are able to cut me to pieces with their charging horn attack every time. I have 26 hearts and they can kill me with just three ragdolls. Are they unblockable? Did they even playtest this aspect of the game, because I'm finding the gorgeous scale of the whole experience is utterly undermined by the piss-poor combat dynamics which begin as cruel and only escalate to punishing as the game grinds on.