A royal, much like a religious leader, should NEVER have the ability to intervene of interfere with the actual civil government.
Parades and tourism, fine,,, but no unelected person should ever have actual power. The same goes for first ladies, I hate that they always have a “cause” and seem to wield actual power.
You’re entitled to that opinion. But the reason the Queen does have these powers is to intervene in an emergency. They are a fundamental break on the idea that a government can violate constitutional law.
The powers exist only to be used to resolve crisis situations - and in the United Kingdom, and the Commonwealth, that is how it has worked in practice. It’s made the countries with this system of government among the most politically stable in the world.
If the Monarch was going around abusing these powers, these nations would rapidly become Republics - and that’s the control the other way around. It creates a real balance of powers.