For me the game was up during the prorogation debacle
The primary, most important duty of the modern monarch is to act as the ultimate protection for the people against the overreach of power. Arguably, that is the only real duty of the monarch. During the prorogation debacle, the Queen utterly failed in that duty, that one reason for being for the monarchy, and when it came to the crunch - nothing
An insightful post, Flumpaphone; I totally agree with the gist, though the outcome of this was no surprise to me
In fairness, and in theory, there's a certain amount that the Queen could have done, but when inaction inevitably follows because of "precedent", we get the spinners who insist that even this is a positive because the Queen "doesn't interfere"
Again to be fair there are a few other "roles" such as head of the Commonwealth, Head of the Church and being an example to us all. However the first seems only to exist because she quite fancied an Empire like her parents had, the second is a joke when so few are members of the CofE or even have any time for it, and the third is perhaps best unmentioned