I can’t speak from the British Commonwealth perspective, but from a Swedish perspective my opinion is this regarding having a monarch:
Yeah, it might not reflect our modern values well, but since the (Swedish) monarch is mostly ceremonial and completely unpolitical, there’s actually quite little to hate about it. They’re just the mascot of the country. There’s far more pressing issues in our country than having that confused old guy as head of state.
I don't know about Sweden, but the UK monarch is an aristocrat that owns loads of land, businesses, trusts, etc, and his money comes from that. At least, he gets to keep about a quarter of it; the rest goes to the Government.
In Sweden that might be true. But in the UK the monarch has some vestigial power. Even though everyone assures that if he ever tried to actually use those powers they would be taken away. But it doesn't change the fact that in the UK the monarch still has power.
Let's see where we're at after November before we start shit talking too much.
There's a very high chance that if Trump wins, he'll make himself a monarch