I said "seems" because I didn't want to make the statement absolute and spend a bunch of time debating the point. Regardless of what is theoretically possible, what appears to happen in practice is a (terminal imo) short term focus.

The most important contributors to a company are said to be the share holders, but investment via stock is a very temporal affair. Just get in, try to enforce policy that will quickly generate increase stock value, then dump it before it crashes and move to the next.

And no, I don't think any random control is a help, just that no control what-so-ever is just as bad as all the wrong controls.