I have heard, more than once, that the M34/63 series of .22s have a "habit" of tight barrel/cylinder tolerances. To the point of after anywhere from 10 to 20 rounds the cylinder will start to bind due to residue on the face of it.
My wife's 4 inch M63 does not seem to do this. My 2 inch M34 sometimes does, depending on the ammo used. However, it is easy to clean the cylinder face and keep on shooting.
Yes, my M34 is a bit stout on the trigger pull. The M63 seems to be better.
However I still like the extreme "portability" of the J-Frame .22s. If I were wandering the woods in an area where I was free from bears, hogs, or cougars [not really a threat..but] I would carry my 2 inch M34 without concern. One can pack a LOT of .22 ammo and in an extended woods stay it would be fun to have a lot of ammo along for plinking, etc.
I also have a 6 inch M17-4, a 6 inch K22, and a 4 inch K22. I will be shootin' the heck out of those guns too.
My M34 currently prints into 3 1/2 inches at 25 yards and the K-Frame .22s will do 2 1/2 inches or, in the case of the 6 inch K22, 1 1/4 inches. Those groups being with one specific brand of ammo.
I personally think its a simple matter of how much weight one cares to pack. And truthfully, the difference in weight between a 4 inch J-Frame .22 and a .22 K-Frame does not seem to be a bother to me.