I think you are taking a British slant of things, you cannot be head of state in the United Kingdom unless you are born into the royal family.
Taking America as an example, quite a few ex presidents were born in quite poor and humble families. Harry s Truman is a typical example, they were not all from Rich stock like Donald Trump.
My point is, in America it is possible and has happened that you can be head of state without being born into a particular family.
Also it has been proved that your family doesn't have to be wealthy.
Well according to
@WNRH in the previous post before yours it is important to have a head of state (rather than a president) even if it is apparently meaningless as you stated in your post.
I think you royalists have to decide whether being head of state is an important role or just a name that somebody is given by birth.
I can't accept that you both are royalist and love the Queen and will argue all day that a royal family is necessary... however you will never change my mind in thay they are a terrible family to begin with, not a family you would hold in any kind of esteem, and that being born with power and privilege through an accident of birth is an archaic and outdated thing to foist on the population.
Little point in arguing further, I will never change your minds and you will never change mine.
I suppose it's a bit like brexit.