I think the point is you may not know who is "useless" at the outset and rather than create an argument and dissension at that point, you use vesting. Then whe

I think the point is you may not know who is "useless" at the outset and rather than create an argument and dissension at that point, you use vesting. Then when you find out (or all agree) that someone is useless, you can get rid of them (which you are going to have to do anyway) and the amount of equity that they started with is essentially irrelevant since most of it never vested.