http://www.thetruthaboutguns.com/2015/08/daniel-zimmerman/self-defense-tip-avoid-carry-gun-rotation/
I thought this was an interesting read. It certainly is on-point about how “repetitions are how we become accomplished at any given skill,” and that “when you switch to a new gun, there is an inherent re-learning process.”
An excerpt:
Can a good shooter bounce between platforms and still perform reasonably well? Yes. However, any experienced shooter knows that you will shoot substantially better with a platform that you have been consistently training with. A handgun is a defensive tool, not a fashion statement. You don’t need to change your handgun like you change your shoes to match different outfits.
The author also accounts for differences in manual of arms between a rotation…it’s fine if you’ve trained for this in a self defense scenario (not just casual shooting when you visit a range). For example, some weapons have safeties, some do not. Some are DA/SA and some are not. You’ve to gain proficiency in those manuals of arms while accounting for the differences. If you do not, you’re putting yourself in danger if you’re used to a particular gun that doesn’t have a safety and you’re carrying your Tuesday rotation, a gun that has a safety…you end up in a self defense scenario and a bad guy is upon you…you draw your weapon and attempt to fire but the gun’s safety is still actuated!
I recommend this as good reading material, is it definitely contains common sense logic.