It's not that simple, the temptation is going to be there in games like this. I can tell you with 100% certainty that if Bloodborne (my first From game) had an easy mode, i would have switched to it on the very first level, had i done that there's no doubt in my mind i wouldn't have had anywhere near the sense of accomplishment of going through and beating it.
Bloodborne is easily a top 10 favorite game of all time for me, maybe even top 5. If i had played that on easy that definitely wouldn't be the case, i would have run through the game not understanding what the game is trying to teach me, using the same strategy for every fight, and probably wondered why everyone praised these games so much. Or worse, struggle through the game on easy and severely demoralize me, resulting in me dropping the game entirely.
I'm not saying that an easy mode is going to ruin the games, I wouldn't be upset if they added one, i'm just giving you my personal experience with these games. It without a doubt would have hurt my experience.
I also think its worth noting that Sekiro is Froms 6th title like this, using 4 different IPs, among 3 different publishers, they still to this day don't have an easy mode in there. So either From are a bunch of incompetent devs that don't understand game development, or they're intentionally being mean to players who are too intimidated by the games, I don't think either one of those are likely.