Earlier quoted context omitted.
> That’s what makes it IMO a superior system. Wouldn't you want to know if what you bought are actually, say, AAPL shares or "synthetic shares"? An AAPL share will always be worth an AAPL share. What can you say about those "synthetic shares"?
The point is that the value of AAPL is just the value of its future dividends. As long as a creditworthy institution guarantees the same stream of dividends, they are identical in value from the investors perspective. The biggest asterisk is hand waving away the credit worthiness of the synthetic issuer. But this is a solved problem. We have plenty of derivative markets, where a counterparty guarantees some cash flow…
No, the stream of dividends doesn't have identical value.
There are other relevant corporate actions.
Shares can vote, your stream of dividends cannot vote.
If the company spins-off a segment it may distribute shares of the new company to shareholders while the owners of that third-party stream of dividends won't get anything.
If someone wants to acquire the company they will make an offer to buy outstanding shares, they won't care at all about those syntethic streams of dividends.
In general, if you want to sell a delta-one derivative that's fine. But you cannot sell that to someone who wants to buy a stock!
Would you want to be delivered a derivative when you bought a share in the market?
That wouldn't be shorting the stock, it would be selling something else. Related but far from identical.