Just,
The point is that he wants to change the accepted/ established practice where he “may” be the hazan. Unilaterally. And the justification is because it is an aging Jewish center. So being an aging population is reason to make unilateral change?
Were you being consistent in that concern of yours, that each should follow their established hangagah, you too would chastise him for his chutzpah.
It has nothing to do with wether you say piyutim or not, it has to do with making a unilateral change to suit your current whimsy.