Lots of discussion lately about a carry rotation, with the general idea a carry rotation is bad. I think there are good and bad carry rotations.
Here is one carry rotation. Some dude has six firearms of different brands and types, like a 1911, DA/SA, LEM and a few different strikers, and he picks one for the day based on what he read on some forum, and carries it. Each one has a different brand holster. Shoots some at the range every few weeks or months, mostly with his favorite one with the lightest trigger, because he shoots the best groups with it. That is not the one he carries, because well it has too light a trigger and it is too heavy to comfortably carry.
Now take someone like Darryl, who has a 327 in his pocket, a Beretta 92/PX4/365XL in an AIWB holster (depending on what he can get away with that day) and a Remington Tac 12 gauge thingee in the Raptor with him. They all have very different triggers and operating methods, are stored differently, and are frankly much more dissimilar than the six gats our dude above picks from. Most on PF would say, LCR in the pocket, check, service pistol in AIWB, check, and a gauge for when things go bad, extra check. So much more diverse firearms, but pretty sensible.
I think it gets down to your reasons and your proficiency, especially recent proficiency. For the last year plus, I have carried a 365XL, Glock 19, or a scaled version of whatever I am shooting as a big gun in CO. I work hard at maintaining proficiency with the 365XL and Glock, and work less hard with the scaled version of my CO gun, since I figure my nearly daily CO practice translates well to the scaled version. What I won’t do is carry a revolver (except with snake shot in a BUG), because frankly my revolver skills are not acceptable to me now. I won’t carry a 1911 variant or DA/SA, because today my skills are not current enough. If it gets to a time of the year where I think I want a USP FS, I am going to refam myself over multiple sessions before carrying it.
So, I believe a carry rotation can be sensible or be stupid.