I agree completely on the Sound Engineer making or breaking you but that is something you absolutely can't control. I will however control everything I can which is my bass and the signal I send to the FOH. At least what's in my hand will be the best representation of my playing and commitment to the sound I want.
Agreed, that when you don't know what you are getting into, you put your best foot forward.
But, my Ampless gig uses one of the Behringer boards, owned by the lead vocalist; who uses one of two of his brothers as our sound techs. The older brother, who was supposedly a bass player from the days when guitars ruled the earth and bass thudded along in the background, mixes with the rhythm guitars out front of everything, except the bass drum on the 1 and 3. The younger brother has a MUCH better ear for studio reference mixes and creates a great soundstage. We just don't get him very often.
Here is my "older brother" Ampless rig:
Here is my "younger brother" Ampless rig:
The Demeter provides a FAR better preamp/DI input to the board. But "older brother" absolutely buries it. So, for "older brother," I simply take the perfectly decent, but far simpler Gen1 Mesa preamp/DI. Less hassle, still provides a decent signal, and much easier setup / breakdown.
And, as I said, with "older brother," it doesn't matter anyhow; because by the second tune, the rhythm guitars are raging and the band is not grooving on the 1 and 3. They are nice cats; so, I enjoy the group thing, even if 'older brother" can't mix his way out of a paper bag.