Perhaps an argument for less plutocratic/oligarchic countries to avoid letting such robber barons arise in the first place.

That's why I advocated for transparency rather than a wealth cap.

The wealth isn't destroyed though, just distributed, so those people should be back to work soon enough.

You whole point is that money is too abusively effective in large enough piles. Dividing it into smaller piles inherently removes some of it's effectiveness, so wealth has to be destroyed if your plan is executed; this is even before percentages are raked off in the form of "legitimate" administrative expenses and inevitable graft, pork, corruption, etc.