Exactly. If you can find even a single instance of shinigami or even Quincy and hollows being harmed by those not spiritually aware then you'd have a point. Also plenty of Bleach characters other than Zaraki have immense stamina feats. Byakuya vs Äs Nodt. He got impaled through all the way through his back with an arm, a gaping gash to his chest, pierced by Äs Nodts feat projectile and two onslaughts of his own bankai, leaving him in a blood bath on a wall and still he didn't die. Komamura got his organs smashed by Tousen, his arm cut off and a gash to the torso from Aizen as well as various lesser wounds and lived. Mayuri had most of his upper body removed by Uryuu and lived. Of course there's Ichigo with a plethora of stamina feats. Starrk was stabbed, beaten, and cut several times and still fought on strong, only falling when Shunsui delivered a deep cut access his whole torso and because of his abilities it made the damage much more than a cut of even that deepened would ordinarily do. Ulquiorra. Although he eventually died, he fought on with his legs and most of his internal organs blown away. Baraggan wasn't fazed by having almost half his body including half his head blown up. There are plenty of examples, some of which exceed the stamina feats that One Piece has shown.