I'm not surprised tbh.
As a pp pointed out a couple with a monogrammed royal doormat were unlikely to forgo this opportunity.
I just wonder why now - frankly I'd expected it sooner. Something to do with coronation negotiations maybe?
I don't think it's a good look for them however, even if the children technically already had these titles. It certainly makes the comments in the Oprah interview spring to mind in terms how they represented their position.
As for the RF again as a pp said I think this ship sailed a while ago as something QE should have done. C might have been relying on H&M's goodwill in his plans for a slimmed down monarchy, but post their move to the US and allegations of racism forcing them not to use the titles was going to be very bad PR.
Realistically C should be looking to the future and sorting out how Charlotte/Louis offspring will be titled so they grow up perfectly clear about what will happen.
As stands it's not something I think H&M should have done, but their children their decision and all that, but it does give grist to the mill about their willingness to take everything his family have to offer that fits their aspirations whilst simultaneously being highly critical of them.