This is a pic on Monarch before I even knew what I was doing. No Sacred bonus at all, lousy Luck bonus. Two or three other things missing. I think he was just Flat-footed from Stealth. But kinda yeah really don't need it.
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This is Unfair, not Challenging/Core. This is a game about weighing trade-offs and exploring/testing your options and figuring out the niches where one thing is good and where another thing isn't needed. Very few things are broken and if you think something is it's much more likely you just aren't aware of the other things you can do and what works best against what challenge.
The easier flanking turns on Sneaks without needing Shatter. It's people who have talked themselves into 45AC being high because PnP who think they have to have it to land their ninth bite.