Thing is there’s two different things here - attitudes to how average Joe at average church approaches worship and doesn’t make it a performance ego trip (though some churches go more or less on performance vs spontaneous)
The second thing is dull wall of noise songs with little melody. (Personally I’m less fussed about it being interesting for musos.) The way I might explain that Is: think of Radiohead’s the bends, it’s kinda indie sound but you can hum the melody’s - some delirious stuff back in the day had that Britpop influence melodic focus ... some of of the more recent stuff doesn’t have that and it’s dull flatness verse quiet chorus verse loud chorus before the inevitable MASSIVE bridge (which often is the only melody that sticks in the head)