Delaying until final sale encourages people to keep money in the market. Money in the market is, ostensibly, providing a value to society as good; probably better, than anything government has ever done.
The distinction is "wealth as personal consumption" versus "wealth as resource allocation."
The former is something that only benefits the wealthy person. The latter is something that already benefits society.
Wanted to post exactly the same comment.
We are yet to develop an appropriate terms, that are _widely_ understood that describe the problem in details.
Personally, I don't see the problem with "rich getting richer". I see the problem with poor getting poorer. It seems it is waaaay more complicated then the simple tax the rich
Even a rich person's consumption "benefits society"* by stimulating the economy. Their spending is someone else's salary or profit margin.
*Leaving aside that most consumption is a negative for the environment.