10ga I would say is far from outdated. It has the ability to reach out and touch some bird. Sure, there is 12ga loads with 3.5" payloads, with the weight of a 12ga. Little extra heft of a 10, and you have less recoil. Ill take that any day. I question the need for the 16ga, but all the other sizes, theres sound use for them, for each user. 28ga falls between the 410 and the 20ga nicely. Some want more oomph then a 410, but may not like the 20ga for whatever reason. If we want to be realistic, 90% of whats out there has no use, or need. 22LR, and a 45/70 combined will kill anything in the NW hemisphere, all the other guns are useless,lol. But you cant tell anyone with an '06 that hehe