I get what you mean on one hand but honestly I wouldn't like it by lore perspective. If any silly monster could break it by doing high enough defilement then the blessing would be kind of a weak sauce and pointless, at that point it would be better if it didn't exist to begin with. Honestly I kinda don't even like it that you can lose it early with the pregnant woman fight. It has much more emotional weight if you go through most of the game with it, and then the sense of loss when that final bastion of purity is gone too. Personally, instead of the village priest putting a parasite in you almost guaranteed (unless you have mad skills), I would have had him break the blessing, making it so that you are almost guaranteed to lose it, considering avoiding capture from the cult is not all that hard. Or I would have added another boss fight of sorts into the cathedral underground that is equally nearly guaranteed to beat you the first time to break the blessing. Either way, I think losing the blessing near the end has much better narrative weight and I would have made it a near guarantee that you will in fact lose it near the end to mount tension.
I see what you mean and I get that a single screen full of lesser tentacle parasites can get you from 0 to 10 - which would be silly lore wise if that was all that it took - but overall my experience with the game is that defilement NEVER reached 7 unless I was about to die to a boss with minions.
Considering that:
1/ Bosses, the only reliable source of defilement spikes, will bypass the blessing in their game over scenes anyway
2/ Cheap enemy swarms that can abuse defilement stacks are easily dispatched and are in areas where you can just fast-travel to a statue
3/ Statues and Haanja both purify defilement away for free
4/ Having sex in a captured event will remove more defilement than they add, oddly enough
You are so unlikely to reach max defilement -
except in the first setting where pregnancy/eggnancy usually will happen anyway - that they might as well beef it up.
The fact of 4/ means that a single goblin just plowing away at a captured nun will never break her blessing, so really the lore is covered there.
As for the narrative weight - I get what you mean, but does it really create tension? You can die or get turned into breeding stock in so many different grotesque ways. Does pregnancy - which is EASILY cleared and will not reach its conclusion unless you're already toast - really impact you, over being turned into a meat pinata or a leech seedbed?
I would argue the lack of opportunities to lose the blessing make the game LESS tense. It's extremely unlikely that you'll ever lose it unless you try.
