I think the thing about the capability to shoot multiple cartridges is overdone. First, the less powerful, if not all of them, are scarce and relatively expensive. Secondly, the size of the gun would be overkill for the smaller ones, leaving the question why one wouldn't simply shoot a 22. The whole point of the 327 Federal is that the smaller cartridges are not powerful enough for any meaningful role.
I know we have went over this a few times. And it is subjective to the user.
( thats why more than one gun is available in the first place)
For some people having options is important and a big selling feature.
I am one of them.
For me the 327 Magnum fill three roles.
My Wife's bed side gun. She is not a shooting enthusiast at all. And the only reason she has a gun is my nagging. I got her a Taurus M327 snubby.
Trying to train her up on full bore 327 loads was a non starter.
Started her out with 32 longs. Her comment ( This is not so bad I can do this)
Was able to train her with the manual of arms. Loading, unloading, Firing, ect.
With no recoil fear involved. Just made it simpler.
Then after she became fully familiar with the fire arm. We went through about 1000 rounds of 32 long.
Then we started to up the power. A few trips with 32 mags. Then finally the 327 magnums.
Pretty heavy load in a 2 inch snubby. She can handle them. She could have to begin with. But I know her, she would have went " eww thats to much" and gave up.
now she has her gun and she wont let me run off with it.
Thats just one. I have my own reasons I like it.