Most things you listed I agree with. As with most things in life, a little bit of bling looks ok, but so many people go overboard. I can't think of one thing that is "decorative only" on my bike. However, if I add something that is functional, I do try to make it looks as good as possible.
Some things are a compromise because I use my bike as a commuter year long. For example:
I much prefer the look of my bike without bags, but I don't like spending 10 minutes every day bungie cording a bunch of crap to my bike either. I could not use the bike as an everyday commuter without hard bags.
I don't like windshields, but I don't like riding in 35 degrees with the wind on my chest either, so I use a quick removable shield when it gets cold.
I don't like the look of a sissy bar, but I love having my wife on the back of the bike more than I dislike the sissy bar.
I have personally evolved to the point that I no longer worry about the looks of the bike with all of the "practical" stuff on it. I am able to ride the bike more often due to the compromise in looks, and that is enough for me.
As far as others disagreeing with me... as the old saying goes: "If two people think exactly alike, one of them isn't neccesary." Different personalities are what make the world interesting. Who wants a bunch of clones riding around on bikes that all look the same?
2007 Red Yamaha Roadliner S
2006 Black Mean Streak (sold)
Honda Spirit 750 (sold)