The luxury the British have is the monarch can be great, mediocre or worthless and things will go on regardless. Charles has a soapbox yo spread his idiocy about the environment but I suspect only the already-convinced will listen.
The monarch has only 1 official power of memory serves… they can approve or reject legislation… “Royal Assent”.
However the last time they rejected a piece of legislation passed by parliament was 1707.
So the nation doesn’t depend on the monarchy to operate.. they are figure heads and can do diplomatic duties… but in terms of functioning of the governance they are a rubber stamp