The tree examples just reinforce the "form follows function" mantra for me.
Shade is good, oxygen is good. Trees produce both better than turf or natives. For so many Midwest courses, if the main design goal was golfer comfort, planting trees was a good idea. Granted, they didn't consider the "authenticity" of respecting the landscape, a la Prairie Dunes, and going virtually treeless as worthwhile, and it has some design, environmental and people benefits as well. But, you are really designing for golfers first and foremost.
So, for most courses, I don't think we are really objecting to the idea of tree planting as much as to how badly it was done, by not consulting architects or even arborists. Typical amateur mistakes were cheap, faster growing varieties to get that shade faster, straight lines because of no creativity or design sense, too much of a good thing (i.e., just keep planting after an area is full) and not considering the mature size of the trees when planting.
For a modern example of form not following function, look at Trinity Forest, specifically designed to host an early summer PGA Tour event in Dallas, TX. The decision was made to do a links course (odd, given Forest is in the name.....) and it had some technical aspects to it - designed on a former dump site, there are some issues with penetrating the soil cap, methane release, etc. But, if the function was
host an early summer PGA Tour event in Dallas, TX, perhaps a tree planting scheme to keep customers shaded would have been the logical form to follow that function, and alas, the course lost it's tournament after 2 years, largely credited to no trees and spectator discomfort.
Short version, if a course didn't or doesn't work well for it's intended purpose, we can expect someone to point that out and eventually it will probably be corrected. I don't think Tom is even saying that in a blanket way in his OP. His complaint is when nothing is drastically wrong and yet someone wants it changed anyway. Some situations are obvious, and black and white, others get more complex and are many shades of grey, where no decision is clear cut, but simply a choice of which single prism point of view is deemed relatively more important.
No course is the same as others to prescribe some predetermined agenda or formula for design, whether that was modernizing in the 60's, or restoration to the current "preferred look" of architecture intelligentsia now. Neither are likely to be correct without careful individual study.