Haven't actually tried it but it looks like it doesn't allow for nebulous plans. Lots of plans start out only half formed at best. Say you want to go to the beach. Your only time constraint may be some weekend soon. However your friend might want to tag along and he's only available on a certain Sunday. Purchase plans can be even more nebulous. You could want to purchase a new laptop but you friend tells you that Apple has a big announcement coming up so you decide to wait until after that.