It's noteworthy that President Macron is less of a suck-up than other world leaders when he discusses Trump. When your nation has nuclear warheads, there's a limit to how far another nation can bully you.
Starmer likely worries about endangering trade with the US, post-Brexit, and about giving political ammunition to the conservative press and to populists like Farage. I agree that having nukes isn't all that matters.
