Apple also doesn’t need that many investors at the moment, so why should it care much about what investors want?
Also, as I said, share prices don’t need to go up to make investors happy. for example, the typical pension fund is perfectly happy with an investment that will never win them the jackpot, but also is extremely unlikely to lose them everything, and very likely will regularly pay dividends.
So, a majority of Apple’s shareholders may be perfectly happy with the status quo.
The board is the one that has the power to fire the CEO not shareholders.
And yes shareholders are involved in deciding the composition of the board. But unless there is some egregious governance issue or a complete breakdown in financials no one is going anywhere.