For a total backyard renovation you could expect to need several diverse subcontractors to complete the job. A one-stop shop pool builder will ensure that things are done as timely and in a cost-efficient manner as possible. When there are multiple contractors involved, each phase becomes more and more delayed as the time management and scheduling may become distorted.
Not everyone is right for every job. Choose wisely! Historically, contractors for any job were chosen by consumers basically for the price, not quality, or availability. Now, with the electronic/social media age, there is more criteria to choose from, and more research available at your fingertips.