-
re-investing in the company
Buybacks are reinvesting in the company only in a financial engineering sense, it's not investing in productive capacity or anything useful. They are aiming to push up the share price.
I'm not a banker, but both are investing in a financial asset, rather than in productive capex, to increase their share price. I don't see such a big difference.
If you asked your CEOs if they wish they had invested in bitcoin rather than in buying back their own shares you might not get the answer you are assuming.
You think Saylor would have been better off to have done share buybacks...?