People put themselves forward to serve. Not all of them have the correct skillset. Sometimes that can be nipped in the bud and they can be told "yeah, but let us walk through techniques etc for a couple of months before we let you loose on a Sunday morning". Teaching that skillset is time consuming. Time is not what a lot of us have.
This means that people slip through the net and as we play we are thinking "is that ok?" and "why would you play that there?". Not every week, but some weeks. The beauty of it is that a lot of it goes over most people's heads. It is SUPER frustrating for those of us who have put the hours in. But I guess it is a mentoring situation - a bit like Brass Banding. The tricky bit is the "you are not doing that right, let me help you" and the finding time. But being in community is costly.
I would prefer to have one acoustic played well and one vocal and leave it at that. It is leading, not performing. Sometimes that is a difficult convesation. As long as the congregation have a cue to start singing in the right place, everything else is secondary. If we are relying on a stellar band rocking it out to whip up something, then there is a problem right there.
I very certainly do not look to playing in church to get my musical jollies. It is to serve - like stacking the chairs, and no more than that.