If all my money were stolen when I die (let's say, 100% inheritance tax), I wouldn't have much incentive to grow my business more once my business makes more money than I can possibly spend in a lifetime.
Sure, some people may still do it because they love working or because they love providing for their society.
The main reason I want to accumulate money, is so I can offer them a job instead of them going through the corporate bullcrap I had to do when needing some starting capital.
Bigger businesses are capable of bigger bets (think Elon Musk) which benefit everyone, removing an economic incentive doesn't sound wise for innovation and growth.