Condition statements do work that task lists cannot
A task list says the lift lobby glass is cleaned daily. A condition statement says the glass carries no visible marks at eye level during business hours. The second is checkable by anyone at any time and does not depend on knowing what happened at five in the morning. It also allows for the possibility that daily cleaning is not sufficient, which a task list never surfaces.
The two are complements rather than alternatives. The task list tells the cleaner what to do and supports the pricing. The condition statement tells everyone what the result should look like and supports the inspection. A scope with only the first is impossible to assess objectively; one with only the second gives the contractor no basis for costing the work.
