Barb, thanks for sharing the pain. That's part of what we,re here for.
Sun damage: I had some of that in spring to triangles and the Caryota. Also, the Washies. All are in full sun now and loving it. I got the bottle palms from the roadside vendor and they were already in sun. So, I think they can handle sun, perhaps after getting used to it. (No idea what the physiological mechanism of that, if it even happens.)
Wind damage: oh, no! Strong winds in late May literally pulled a triangle out of its pot. Now I wonder how the other one survived, as it is planted too high.
Coconut: hmmm...no idea. I guess I think of them as difficult. Need to get our members from Kansas to help....
Cycad: what the heck? How did that happen?
---Erik

So the issue seems to be "grown in sun".
That makes sense since everything I provide artificial light for during winter indoors is sunburning, even more than last year (with less sun...go figure!) 😕

You make an excellent point that there probably/obviously is a physiological mechanism.
So if seeds are started indoors in winter, and subjected to artificial grow lights for 4 or 5 months before it's warm enough to place them outdoors...sounds like they'll NEVER be able to handle sun (versus their habitat brothers/sisters.)
Other than slowly acclimatizing them to sun (I thought I was doing that!), there must be a solution among the scientific minds here.

One can often tell if purchased plants were grown in shade or sun.
I recall your big Sabal with the stretched blue leaves...likely grown in partial shade.

Cycad...visiting children unsupervised 👿

Yup maybe Don and Steve can chime in re the Cocos.

And I apologize for making such a fuss!
After all Erik you've got pain that makes my complaints puny.
Thank you!

Barb