My guess would be the crown can totally take those powers back, but then the monarchy would be quickly overthrown as their only accepted role these days is to look pretty, draw in tourism, and entertain foreign dignitaries.

Are these tankies in the room with us right now? Fuck the CCP, but we're talking about the west right now, stop trying to divert attention.

all decisions are handled by parlaiment

Who is backed by the undemocratic FPTP system, extremely pro-establishment press owned by capitalists waging open class war and a literal house of "lords" who have direct and legal legislative influence, not even lobbying. Imagine if Elon musk could reject legislation. Yeah, democratic af.

It's a ruse you fell for, nothing more.

who are actually a net possitive from tourism.

Myth. Many countries do not have geriatrics riding around on golden thrones amidst record food bank use while having far more tourism than the UK, and I mean western European nations, not typical global south tourist destinations.

China unfortunately is such an oppressive and bleak place that nobody wants to go there unless they have to or if they’re doing so accidentally by not realizing what happened to Hong Kong.

That's counterfactual and undermines your argument, the amount of tourists from Japan, the US and EU alone is immense and I fear most of them know, but don't give a shit about Hong Kong (though they really, really should).