I can understand the 'loudness' thing but an experienced soundperson would know how to balance out a system. The musicians themselves need to learn to play 'quietly'. Me personally, I don't like it loud either! One of the main reasons I stopped going to the clubs while in my early 20's! I just don't understand the need for insane volume levels!!
On the other hand, elders have been known to resist modern music and church ways.
Lastly, having an inexperienced "soundperson" dictating to musicians is the last thing a church needs. It should be a joyful experience. When it's not, everyone suffers!