Thats true, but that just means you don't need to over invest in crit rate, the sword has you covered. For the record, my crit rate in those numbers was whatever those settings I mentioned generated. I just tried to recreate it again real quick and it looks like I had a base (from artifacts and non-weapon sources) crit rate of roughly 25% when I did those calculations.

So thats with all 5 artifacts rolling crit rate sub stat, and rolling it at the optimal possible roll. Doesn't look like its taking enhancement boosts into effect, so its probably theoretically possible to get artifacts with even higher crit rates but for the vast majority of players (or at least ones like myself) these would be legendary dream rolls the likes of which I may never see already. Unless I'm missing something (and I very well may be, I'm only at AR45 at this point), to get to 50% crit rate with out it being from your weapon itself, such as Black Sword, you'd need to sacrifice one of your artifacts primary stats, which would incur a huge loss of attack. Maybe thats worth it for some weapons, but for the Royal Longsword you can stick with an all attack (outside of flower) artifact set.