If they also solve fusion, famine, climate disaster, cancer, dementia and child development disorders it isn’t as clear cut

Once you start from destroying democracy, the chances that the results will quickly put keeping the owner in power ahead of anything good for humanity are high. Autocracies are, in practice, inefficient messes that put loyalty ahead of competency, so one cannot really get prosperity in exchange for no representation. The loss of representation will get us the loss of prosperity real quick.

This also applies within companies. You can get temporary lucky with a CEO that isn't accountable to anyone, but then that brings sycophancy, leading to degraded decisions. It's how it always works.

So it's very clear cut, because you are offering a trade that cannot actually happen in practice. The economic growth will turn into zero sum status games, like it always has.

Do they? There's been a lot of hot air, quite literally, but aside from some math conjectures actual evidence of meaningful progress on anything that actually helps humanity seems rather thin on the ground.

The word happiness, fulfillment or even freedom didn't come to mind?

Well at least you're planning to have a very healthy population of enslaved serfs. I'm sure they'll appreciate all you've done for them.