You're absolutely right. CEOs (and other execs) need measurable workload, just like the rest of their staff. If you're not measuring it, is the CEO landing deals, or are they just playing golf with other members of the managerial class? The inquiring mind wants to know.
Get over it. Until you earn yourself a seat on the board, your inquiring mind will likely remain inquiring. Not sure why you expect that the CEO needs to justify his/her schedule to rank-and-file employees.