Likewise the soundguy has his own gear that he's comfortable using on a nightly basis. If he politely says "I am more confident I can make your band sound good with Gear X than Gear Y" are you are saying you attach no weight to that opinion whatsoever??
I'm sorry, but this is a hypothetical that's dealing with absolutes which I never proposed.
No one cares how polite you phrase it...I'm kidding, that's a great way of broaching the conversation, however-
What I said was, if a player comes to me with an amp, as in the OP's case, I've explained an option for capturing their sound.
I then countered your argument that players should (or must...eh) abide by the engineer's decision, by stating that it would be more reasonable to work with the performers and their requests. I said it, it's up there...
If I use JimmyM's band as an example...We have a contract, so let's pretend his tech rider states "kick: audix d6, snare: audix d2, etc, etc BASS: DI-provided by band"
I'm going to contact their TM or FOHguy about drums and state that I don't carry audix, I've got akg & shure...as long as it's equivalent, and we agree...we're golden.
All I'm going to ask, about bass, if I do, is whether that info is current..."does he have his own DI?..cool, now about these fresh lilacs and blue m&ms..."
Now, if he shows up, and his redDI falls out of the truck and breaks, I'll hand him a tissue, and we'll discuss further options. I wouldn't even dream of doing anything besides pointing out where I left the xlr for him. Anything else would point out my inability to read a technical rider.
So, that's a contractual obligation. ooOOooh.
But what about just working with the band?
or, to put this in a different light...
How the hell do you expect to learn about different microphones and equipment, if you choose not to use it? Do you think I've joined a secret society that has a warehouse of new and used equipment that I test out on women dressed up as scantily clad catholic school girls who are above the age of consent? Well, you're right. But we only use that stuff in the videos...
The real experience comes from 'winging it' in the field.
This ain't rocket science. The basic difference between my ruggedly handsome house DI and someone's expensive DI is basically signal:noise and frequency response. Wait, that's it?