Why don't you show us the correct sample size then? It's not that hard, go to www.buzzer-manager.com -> My League -> Statistics per team and post your season 3fg%. It seems to me that you are as much just making posts for unfounded whining as others are just looking to respond negatively (just to be clear I don't think either is true).
My team shoots just 27.4% on the season but I have an inside team. Other teams vary from 18.5% through 34.4%, so that's quite low. However, with teams being build around OD and IS (and defense rating in general being higher than offense rating), that could be just the expected outcome. I don't expect high % when you get 7 outside scoring rating vs 12 perimeter defense rating.
If you want a more complete analysis, also make an overview of the average of Perimeter Defense and Outside scoring ratings of the teams in your league (look up a team and select "Ratings" in the dropdown menu).
THEN you can make a valid point.