It's not meant in a 'they're a lesser human being' way, it just means they're further down the line of succession. You're making a bit of a storm in a teacup I think.

For many, royalty is not a joke. In my view, the role of the Queen as a unifying and stabilising influence in the UK is invaluable. Has she been a perfect human being? Of course not, but her dedication to her duties has been inspiring to many including me.

Jleyank called no human lesser. Their membership of the royal family is lesser. Its not up to debate - aristocracy is hierarchical.

would it be out of place to talk about lesser/lower management in a company hierarchy?

because that's what the royal family is

it is even referred to as The Firm