I wouldn't put dividends in the same dirty bucket as buybacks. Buybacks are just a way to manipulate the market and dodge taxes.
Manipulation of the market rings hollow. The price changes, but there is no deceit. Running a successful business or starting a dividend also changes the price, but isn't manipulation. Who exactly is duped by BuyBacks?
Investors have turned dividends into a religion. They must come every quarter like clockwork and never decrease; otherwise, it seems like there's a five-alarm fire and the place is on the brink of bankruptcy. It is irrational but reality.
If BuyBacks make stock price go up, stockholders haven't made any money yet. They can be wiped out at any time and lose everything.
BuyBacks simply give the shareholders the choice of if and when to cash out any gains and losses they may have.