Dallas wrote:
Somehow it's not ok to run your engine up, but acceptable to taxi forward
another 50 feet onto the runway and firewall it?

The real issue here is extended ground runups for maintenance. Extended
full-power turbojet runups at 2am make the neighbors much, much sadder
than anything a piston engine is going to produce. (Barring, maybe, a
C185 with a long two-bladed prop on a full-power takeoff. Yeeeeouch!)