Changing the nussach hatefila is a big deal. Not comparable to those things at all. But still a big deal.
Who changed nussach hatefila?
Fwiu often shiur starts right after davening, whether it's a short halacha, mishayis, or a sif chofetz chaim, isn't that terrible as well? To change davening like that?
This reminds me of the gadol that said at least they are adding rosh hashanas not taking away.
--------------------
You need a serious serious Chesbon nefesh this Y"K, if you get disturbed by other jews saying more tehillim. There is clearly something wrong with your outlook on Judaism and life in general.