Completely agree. Way too many people think training is about teaching your brain how to use a weapon. That is only the beginning of training. What the real goal should be is to teach your body how to use the weapon without having to think about it at all. Every time you change a platform or introduce a new one, that process has to happen all over again to achieve real skill with it.I'm certainly no "Expert", but I have been shooting Shotguns at game and at clay targets over 40 years, with some success at both...My experience tells me to use what you're used to--In other words, if you've done a lot of conventional shotgunning with a Vent Rib with Bead Sight, use that--If you shoot a lot of USPSA with a RDS on your Blaster, use an RDS that's similar to that on your USPSA Blaster...
What you DON'T WANT TO DO is to CHANGE to an UNFAMILIAR SYSTEM on a Gun that you might end up using in a real SD situation, no matter how much better the new/unfamiliar system might be "In Theory"...
I own a revolver for hunting. Every other handgun I own is a Glock. Not because I think they are the only handgun for SD, but because I can pick up any one of them and my body programming applies.