Not convinced about overtightening – really, with a hand tool, not an allen key?
Oh yeah, absolutely- the recommended torque is 0.7nm-1.5nm, which is almost nothing. Fix a weightless lever 1 metre long to the tool and put an apple on the end, it’s that much. I don’t know what the max you could apply with the shimano tool by hand is, but lots more than that. Maybe 15nm?
Arguably it’s a design flaw, this- Hope designed their BB with a bit of pragmatism, it’s pretty resistant to overtightening. Shimano trust us to do it right, but mountain bikers overtighten everything, except when we forget to tighten it at all.