My point was it doesn't matter what sort of departure you are doing, you still need the performance to make the required gradient.
If when doing the Non-RNP departure you must have the "visual return to land" option, why then are RNP departures allowed with engine failures at potentially very very low altitude in IMC, with a higher gradient requirement than a Non-RNP departure? The RTOW penalty must be pretty severe, although I suppose it's mostly fairly chilly there?