You don’t need a shotgun, a handgun, a concealed carry gun and a whole other set of guns for hunting and whole other set of guns for the shooting range etc. That is not sensible, that is just someone wanting a whole lot of guns.

What you described in the first sentence is entirely reasonable, you just don't understand it.

Here's an evaluation based strictly on cost.

My hunting rifles cost something like $2 per round or more to fire. If I want to go to the range and practice technique firing 50 to 100 times is normal. This is a cost of $100 to $200 dollars.

My plinking, or training, rifles on the other have a cost of about 4 cents per round to fire. So now a practice day at the range is below $5.

However I cannot hunt with a training rifle, it's caliber is far too small.

It's the same with shotguns and handguns. The heavier ones are necessary for real activities but they cost a lot to train with. The smaller caliber ones are much less expensive to train with but aren't useful for real work.

What you are missing, IMO, is that firearms are tools and people who use their tools tend to own more than one of each.