Erik -- I haven't read "Slicing Pie," but I'll check it out (thank you for the recommendation!).
Although I generally support founders' shares vesting, there's a disconnect between the good sense incentive represented by a vesting structure and some of the tax, securities, and corporate governance issues created when most of an entity's shares or interests vest. Again, this is complicated stuff and vesting works better or worse depending on a number of factors -- such as the nature of the business, the number of founders, revenue or market growth, and the capital structure.
That said, entrepreneurs interested in using a plan where founder vest in should carefully model how that plan will work. The dialogue around modeling the plan is useful by itself, as it can reveal founders' differing commitment levels; but the discussion is critical to understanding the impact on cash, management control, and professional services needed to get the company through that initial stage of development and growth.
Ideally, a startup structures vesting and compensation to minimize tax and securities issues. By in effect offering stock as compensation, tax and securities issues are often triggered at exactly the time when the company is least able to pay. It also forces the company into valuation issues that are also ill-timed, as valuation is mostly an academic exercise until the product and brand are out there.