I agree in regard to royal titles and peerages for sons and daughters (incidentally, the UK is the only reigning European monarchy which continues to grant them to princes but not princesses).
As for life peerages, a strong argument which can be made in support of continuing to grant royal dukedoms with a hereditary remainder is to point out that other dukedoms in the British peerage are currently hereditary. It could be perceived as strange and contradictory if royal dukes were denied the privilege of passing their peerages to their sons while dukes from far less prestigious families continue to enjoy that very right.
There is a counterargument to this: In an ordinary British noble family, the title is passed on in the direct line only by the heads and future heads of the house. The children of younger sons ordinarily revert to being untitled. And one could argue that royal dukes are not heads of their own noble houses, they are only younger sons of the house of Windsor, of which the Queen or King is the head.
On the different treatments of Royal and non-royal families, the Spaniards solved that by differentiating between Títulos del Reino, which are the ordinary hereditary peerages( which, in the case of dukedoms, also come with Grandeza de España ) and Títulos de nobleza pertenecientes a la Casa Real ( or something like that) , which are defined in the RD 1368/1987 and are the life peerages held by infantes/Infantas by grace of the King.
I guess that one could argue that the main line of the Royal Family ( determined in Spain and in the UK until recently by male preference primogeniture) already has the privilege of inheriting the title of King and the princely titles for the King’s immediate family like his children ( which are the highest honors in the realm). Giving the cadet/collateral lines of that same family additional ducal titles in perpetuity is an added bonus that is not justified. So I don’t think the family is being unfairly treated if it loses hereditary peerages, as long as it keeps the Crown in its senior line.
Giving hereditary peerages to sons and grandsons of Kings was , I suppose, the French custom, which the English imitated as much of the English system of titles is also inspired by old French usage .
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