Although I like to make jokes about their plan to make their son president and king at the same time, I have little interest in the conflict between Harry and Meghan on one side, and the royal family on the other. I will say, however, that it's remarkable how much people's views on this dispute correlate with political ideology. Most right-wingers seem certain that Harry and Meghan are in the wrong. Left-wingers mostly have the opposite view.
And they hold strong opinions on this, even though there is remarkably little publicly available information to resolve the dispute. Unless you have good sources at Buckingham Palace and/or other inside information, the epistemically proper stance is probably agnosticism, at least until more is known. But most people prefer to reinforce their ideological priors over seeking the truth.
It is a curious thing, why people care. It's clear that they do, and have cared for a long time, that's for sure.
Maybe there's a kind of comfort in rituals and/or predictable constants in a complex ever changing world, as well as a rooting interest not unlike sports (or professional wrestling with its "storylines").
For me, the only times I've had momentary interests were in observing ancient rituals: once at Diana's funeral and once at the 1993 royal wedding in Japan, when I happened to be there on business.
My concern is more with the premise: why are the such public vestiges of the era when all power was held by clergy and nobles?
I can't suspend disbelief that we should ignore the off-site of why such dinosaurs exist and why we should give them any power at all to be concerned about the minutiae of anything happening day to day.
The distribution of opinion on this issue is a small example of the dangerous combination of ignorance and partisan/ideological bias.