It’s a bigger Kiddush Hashem to die Al Kiddush Hashem. It’s something every Jews should hope for.
I’ve never come across that principle in my humble studies.
Suppose you’re davening from your phone, and the lithium battery explodes and kills you, cv”s. Would that be dying Al Kiddush Hashem? If so, that’s an argument in favor of smartphones. I never heard of a conventional bound siddur exploding.