Many employees who own stock in their employer do care directly about shareholder value without finding that it makes their job pointless. Why would it be otherwise for you?

Because caring directly about shareholder value is a distraction from what I'm actually there to do. If I focus on shareholders, that leaves less time and energy doing my actual job and would make it more likely that I make decisions that make our products worse. If I'm doing that, then what's the point? I may as well be an MBA or something.

There is division of responsibilities for a reason. I also don't care directly about the bookkeeping, HR, etc., for the same reason. That's not to say I don't care in the absolute. I just don't (and can't) care about those things directly. I contribute by doing good work.