bbwest, welcome to the world of 91
I have flown 91 for the smallest of operators (1 jet, 2 pilots), and for a 91 operation with several large cabin ultra long range birds, that to a casual observer would appear to be an awesome dept, flying people that everyone here would know. And I have done a good bit of 91 contract flying in large cabin jets with quite a few different operators. Earlier in life I was with NWA.
While there may be some procedurally solid 91 operations as you referenced, after flying as a contract pilot for some time, I can attest that the large majority of 91 operations and pilots have no clue of the benefits of the procedures you are espousing, nor any interest in doing anything more that staying out of trouble, which pretty much means basic standardization.
Does this mean that they are about to drop out of the sky? No. Even at that level, they are roughly analogous (statistically) to a typical US air carrier in roughly 1975, if not more due to the reliability of modern equipment and also because of tech advances such as TCAS EGPWS etc. Still pretty safe. Better statistical safety than boarding an airliner in many parts of the world in 2010. Most are not going to be interested in even hearing about a "best practice". Even though you and many others may understand the benefits. They are more interested in what hotel they are staying in.
In my opinion, what makes 91 really unsafe is guys not watching what they are doing, not so much how standard-ly they do it. Of course industry best practices can enhance this, but it can be accomplished to a minimally lesser degree without some/all of those best practices. Flip-side: if you are not watching what you're doing, best practices are not gonna help much...
If 91 is the world you want to be in, thats how it'll be. While you might get lucky and be hired as CP by some uber-rich dude who is starting his own flight department with 2 brand new G650s where you can emulate whatever operation you like, if standard procedures really mean something to you, you might want to get that Delta app up to date, the A320 I'm flying there now is very standardized!
ps-build an extended centerline for scottsdale rwy 21 and take a look about 6 miles out on that line...it is not a place you would want to be, low altitude, at night. Procedures and technology can bite, too.