That's called playing Fantasy Hero, Big Eyes Small Mouth, or Theatrix. Maybe not even Fantasy Hero...
Only reason you routinely avoid dying in fights in FH is the core system is biased to having anyone in armor be knocked out sooner than they die, even with killing attacks.
The idea that a PC can only die for story reasons is just NOT something that has ever been a part of D&D or any tRPG that descends out of it except "maybe" Mutants and Masterminds. But even that is a big maybe.
Its certainly true of M&M3e. There's no mechanical way to die except by agreement. But then M&M has swung far afield from normal D&D derivatives.