A plain-jane hunting gun -- even with a 28-30" barrel -- is probably quicker in the hands than a shotgun that's loaded up with a Surefire forend, extended mag, sidesaddle, etc. The true asset of the shotgun is the SPEED with which it can be used to engage a threat and end a confrontation. If I have 5 or 6 shells in the mag, I generally don't think I need more. Extra ammo is conveniently put in a musette or gas mask bag, or in a bandoleer that you can sling across your body like a Boy Scout merit badge sash. This gives you more ammo than a sidesaddle, and it doesn't weigh down the shotgun.
The "tactical" accessories have their place and can be very useful when needed. If you have a very light 20 gauge, an extended mag or other accessories can add much-needed weight to tame recoil. Tactical stuff can also help us to put together a specialized shotgun, when needed. I'm building a short, folding-stocked shotgun as a trunk gun. It can hide in a low-profile tennis racket bag. This one will have a sidesaddle, as part of its "grab-and-go" mission.
All my best,
Dirty Bob