I agree.
There is, quite rightly a lot of sympathy for him losing his mother at such a young age, and the image of him as a young boy following his mother's coffin is something a lot of people remember and have strong feelings/emotions about. But far less attention seems to be given to William facing exactly the same traumatic event. He is 2 years older but I think, because he was the same height as the adults, the visual is 4 adults and one young boy, rather than a nearly 13 year old and just turned 15 year old both having lost their mother, with their adult relatives.
And to a degree more pressure on William to be the sensible one, not get into trouble, seen to be more mature etc because he was the heir. This might have been their natural personality of course, or maybe their personality is almost shaped in childhood by what's expected of them? Or was he not sensible and mature but the press has created their personas? In some ways Harry gets the privilege (even the b list privilege he perceives he is getting looks pretty good from the outside) without the same responsibilty/pressure?
I think its sad that while Harry says he is open, forgiving, ready to reconcile, a lot of his behaviour and allegations are probably not going to make the feeling mutual. If he really wanted to protect Williams children from the same fate surely having a close relationship with them would be the way forward , and, because of their ages, he could only do that by being close to William first.