I agree with your initial post OP. I'm neither pro anyone.
I will say I do however "believe" in monarchy through personal preference, I wouldn't want a president. But I am happy and willing to accept republicans have valid points of views and a right to their personal beliefs and views.
William definitely has a temper, and it's easily egged on by his sibling. Our siblings always know which buttons to press and we don't behave with our siblings like we would a friend, spouse or stranger. It's a different relationship dynamic.
I also believe US personalities have exploited a very unwell Harry for their own personal and financial gain.
I also believe Meghan has been absolutely blindsided, and I do feel for her somewhat, but I believe 90% of the blame lies with Harry. I also believe she is having to deal with the "real" Harry having now been married/with him for 5+ years, and I think unless that woman has the patience of a saint, I wouldn't blame her for walking away in the future. He just seems like a spoilt, angry man child.
I believe both men, William and Harry are traumatised men, William seems to have faired better, probably due to personality and long term support from Catherine. Lack of substance misuse and applying himself to therapy correctly has probably also helped him come to terms with it all a bit better.
The extract from the book when William pleaded with Harry on the walk back after Prince Phillips funeral was a difficult read, he was pleading with his brother, saying he loved him, genuinely wanted him to be happy but Harry completely dismissed it all, I felt sorry for William in that extract, gripping hold of his brother and begging, literally clinging on to him. It was a sad read.
I can't see them reconciling after this, which is sad to see.
Harry I believe needs an intervention, a serious intervention, and I feel so sorry for Meghan as this burden will fall on to her.