Producer and engineer are two succinctly different jobs. The underlying attitude that the musicians have no clue as to what they want the over all sound of their band to be is an outdated and disgusting model. Particularly in todays modern world where we have access to recording and mixing that even at a consumer grade level can produce product capable of broadcast standards. In other words, your job is disappearing rapidly. I know, I own a studio, and I engineer for many bands as well as my own projects. We let go of the commercial space because there just isnt enough market for it. We still have the gear, analog tape decks included. Granted its not 2" tape, it still gets the job done. The beauty of recording is that bands like Swervedriver, My Bloody Valentine, The white Stripes, Big Black, Joy Division, Tool, PJ Harvey, The Talking heads and so many others have ditched the long held standards by "educated" engineers and producers, and did what ever the hell they wanted too. Where as it defies your rigid structure and belief system. Ive had the horrendous experience of recording in large studios with overbearing engineers and producers. We told them to pound sand immediately and switched engineers. Yes, there is always a task of mixing levels and getting people a happy frequency spot, but your assumptions of why people play bass are way off the mark, totally unfounded and unrealistic. Again, many bassists dont seek to stand out, nor be louder, they prefer a more subdued tone and or to be down in the mix. Soundgarden is a perfect example of this. And again another band that decided to hell with the producer and engineer and did whatever the hell they wanted in the studio. Where your task comes in, is how to get the desired sound that the band wants you to get. Whether your the recording engineer or the mixing engineer or both, and hopefully you have an open mind as where and how to achieve that. From your arguments here though, its clear that you have a finite opinion on how a mix should sound, what the musicians should do to achieve this and how to go about it. Textbook ego that was prevalent in the 80's and even early 90's in the studio. Wether you like the loudness wars or not, the current high compressed lack of dynamics is here and its not going away anytime soon in hard rock, metal, progressive metal, pop, and pop punk, pop country and current country. If you dont want to deal with that, try out other genres that are still more conventional.