I think several things are getting confused here. I’m mentioning two factors:
1) tax efficiency
2) actual risk of losing money/extracting value from their holdings.
If an investor wants reliable, regular income, stock buybacks aren’t helpful. Dividends are. Enough to be worth using less tax efficient structures.
However if an investor wants a maximally large portfolio at a indefinite future point, they generally don’t care about dividends. In fact if they want maximum tax efficiency above cash flow (which such investor generally wants), and are comfortable with risk, they want to avoid dividends.
Stock buybacks ARE more tax efficient than dividends, but also higher risk.
In theory (and usually in practice even more so), buying back the $1bln increases the value of ongoing remaining stock holdings by $1bln.
However, unlike a dividend, that doesn’t get converted into cash. It turns cash into increased scarcity for equity ownership in the company.
Depending on expected future earnings multiples (cough inflated P/E) this can swing widely, but also provide ‘leverage’ for a company doing this.
Which increases ongoing dependence on management of the company, market perception of the companies worth, etc. which increases actual risk to the investor going forward.
It is far more tax efficient though.
Which if ‘everything always goes up’ is not a big deal, and often desirable. If someone is making sure they have cash in a bank account every month so they don’t need to be eating cat food, less so.
Does what I’m saying make more sense in that context?
I suspect that the ‘market goes up’ + automation of trades has also made dividends look less necessary. It’s been awhile since we’ve had a good stock market crash.