The Ideal Job Description

37Signals just posted a description for adding another person to their team. Why can't more job descriptions (and more importantly more jobs) be like this one?

“37signals is searching for another full-time Rails programmer to work on (mostly) existing and (occassionally) new products. You should be comfortable working from home – we have an Chicago office, but mostly work remotely – and be strongly self-motivated and driven (we don’t have dedicated project managers). Strong Rails chops, good software habits, and open-source involvement are a given. We also prefer good writers. In return, we offer a flexible working environment: as long as you get the work done,it doesn’t matter too much from where or at what time of the day. Pay is competitive, health-care included, 4-day work weeks over the Summer, and A Life Outside Computers is encouraged.”