A united Arabia was never on the cards in the post Ottoman era - British and French imperial interests would never allow it. Consequent efforts to unify the arab nations created by British / French have also been thwarted, not in the interests of the West to see Arab unity
Self rule is never "given" it is taken. If it was European powers that had bestowed them independence I dare say it would not be independence at all.<p>And look at Saudi Arabia today: they are standing up to Biden. Things worked out for them quite well.