Erica, I hope you are well and I thank you for the kind greeting. It's a pleasure.
If I were able to help I certainly would. I think the frustration on Daniel's part are that of the course of evolution on the part of Geni. Humans are creatures of habit and the changes seem to disturb him.
I do offer my assistance where and when I can as he is, as you said a relative, a first cousin; Though I think what he dislikes beyond the revisions is that, it seems he doesn't get any positive results from his help request from the help department "The employee staff" moreover, while I'm certain that he truly does admire the work of a volunteer, I think the approaches and responses tend to end with a feel of being attacked and further perpetuates his actions by way of fueling the fire.
Personally, unlike Daniel, I tend to avoid building the tree and remain as secluded as possible, though I can get a visual of his relentless efforts in the exploration of lineage, though I also acknowledge that in turn is a mousetrap of sorts - Though as mentioned in my previous comment in the form of assisting him generate links through Geni for all those documents he has added, it's a bit contradicting.
That said, I think his only gripes are the referenced ones; Change and the lack of participation of those at the helm who he has cited, though I think everyone has made their points and I'm a fan of the phrase "When in Rome, be a Roman" and much like volunteer work, if you don't agree with particulars of change then we are all free to abandon ship.
I don't see resolve on this topic and while I understand no one likes to abandon ship after so much effort, sometimes it's the only alternative in disagreements - Everyone looses something in that scenario - It's either that or, hence, the term "If you can't beat, Join them" in acceptance of a process you can't change.
My best to all. I'll stay out of the ring on this one. Take care Erica and hopefully the guidance you have provided will aid in helping Daniel, if that is in fact the issue - It's well defined in the manner of "How to".
Ed.