Wealth imbalances are bad largely because many assets have upper limits on available quantity, ie. the amount of land in most countries is relatively stable. If those assets are hoarded by a relatively small number of people, it's much harder for less wealthy people to become more wealthy. Our entire socioeconomic system is based on the premise that one can work hard and change their lot, so making sure that's actually possible is important for societal stability even if you don't have any religous/moral/ethical qualms about hoarding wealth.

First the premise of our socioeconomic system. I disagree entirely. Our system is premised on the thesis that if you are useful to others, they are willing to reward you for the utility you bring them; and that it is advantageous for us collectively to preserve a rule of law whereby people might interact safely in this way.

One might work hard and fail or one might work lightly and succeed. Bulletball guy certainly worked a lot harder than many product managers I know.

Now the question of assets of limited supply. That’s sound. But that’s a distribution of assets of limited supply problem. It is entirely possible to have great wealth inequality with low land ownership concentration - in the US 67% of people live in owner-occupied housing. Scotland has much higher land ownership concentration - but lower wealth inequality.

So fixed supply asset concentration can exist without wealth inequality - which, to be clear, is the form of inequality I was talking about considering the original post is about it.