"a trim die relies on literal outside forces,to curtail length. Such things will skew concentricity and neck tension,as well as mar projectiles."
Say,... WHAT? I mean, "Lateral outside forces"... "to curtail length" ... "concentricity/tension ... 'mar projectiles" ... Huh? No offense intended but I have no idea of what you said means in any sort of practical application.
"A rotary trimmer does not on the average,"
"Does not on average," ... does not what?
"In fairness,the worst rotary,easily trumps the best trim die."
In what way?
I only have a few trim dies but they do exactly what they are supposed to do and do it quite well.
You gals need to read slower and shoot more,though I'm digging your accidental humor................
