Yes I agree, as a hunting 28 gauge the Model 21 is on the heavy side for my taste in a 28 gauge field gun.
Most people these days, when buying a gun like the Model 21 are not planning on using it much, if any at all in the field.I believe they buy them so as to have a high quality and rarer gun.For myself, I would call owning one as having a prestige gun.For myself ,a holy grail gun.Not so much as to use ,but to just own and enjoy that I have one.
The chances of myself ever being able to afford one, are slim to none,but always nice to dream about owning one.All just my opinion.

As I have said before, I would not turn down a nice 28 gauge Parker or Ithaca either.