I do understand the emergency procedures in the PoH, and I admit I made mistakes, but neither my student pilot (a German F1 race-car driver who knows engines very well) nor I felt particularly unsafe, but on paper, going against the PoH is a nono.
You still sound like you know better than the POH, if it says land as soon as practical then land as soon as practical, it's not just on paper it's for real.
And if you make a habit of flying without RPM information you will end up dead.
Also if you get a professional flying job and you start ignoring the MEL for despatch you will soon get fired.