I carry a 10mm Auto daily as my duty weapon. I carry the same pistol, a G20 BTW, when hunting and hiking. I use it in competition because it is my chosen platform. The versatility of the 10MM is across shooting activities, not within a specific activity. I realize that my choice comes at a cost, e.g. availability of commercial loads, available of brass and of course cost of ammunition and components.
As far as Power Factor rules, I think they should be kept simple and overly broad. The current rules allow a bunch of different calibers and allow shooters to decide what is important to themselves. For me, I like to use ammunition that closely resembles what I carry for work. BUT THAT IS WHAT I WANT! I desire to use these games, and they are games, to improve my skills. If I decide that what I want is trophies and get my picture in Frontsight (there is absolutely nothing wrong with this either), then I may want to change loads or caliber. I am glad it is my decision and not forced on me.
If I could make a recommendation on changing a rule, it would be in the Heavy Metal Division. Instead of a caliber restriction, i.e., .44 caliber, I would change it to make an established power factor with a 200 grain bullet. That way 10MM, .41 Mag, .357 Mag and other calibers could compete in that division without compromising its intent.