Mike,
I agree. No problem to add sprinklers where wider, and narrow up a few areas by going to two rows. At Wild Wing, for example, the Owners rep was amazed at how much more care I took to creating wavy tree corridors, leaving "lone soldiers" etc. than the other gca's designing courses there. Maybe thats a reason my course is the one they are keeping as they turn the rest into housing developments.....

But you can cost an owner a lot of money by not considering the basic coverage area of your irrigation system. And you can kill trees by blowing the bark off them with sprinklers, or simply overwatering the roots compared to what they were used to before, so you MUST consider irrigation together with clearing for best long term results.
My other point was that live oak corridors generally must be wider trunk to trunk than pine corridors because of their canopy girth. A 200' wide corridor in pines probably plays similarly to a 225' corridor in oaks.
As to your question about taking them out or picking and choosing over time, I have never had too much problem deciding which to take out. As far as I am concerned, a professional golf course architect should be able to make those kinds of decisions correctly up front - not cause the hassle of waiting to see, even if there are always a few tough cases.
And I have touched on the things I consider, like shade, air circulation, the general width. Of course, tree location plays a part - if its right off a tee and can't be negotiated, I figure it will come out later, for example.
That's the kind of thing the experience of designing 50 courses teaches you. It ain't always the theory, its the details of execution that make a course acceptable, good, or a stand out. And I presumed that was the heart of your question.......