Stocks are a thing because no one thinks of them as liquid assets. Steam is making the same argument about bitcoin essentially.
1. Dividend payments
2. The expectation that someone else will want the stock more in the future. (Often for reason #1.)
Financially, there is no other logical reason to possess stocks. It was part of the larger lesson that companies often perform irrational actions because they are made primarily out of people.
Nonetheless, for any of the "commonly traded and indexed investment securities we all talk about colloquially as 'stocks'", the daily trade to capitalization ratio is routinely an order of magnitude higher than bitcoin.