So this whole TPA thing to me is a bit of a cluster as far as I am concerned. I respect and understand the need while learning the ropes but overall, once in a classroom and teaching multiple subjects it becomes quite a daunting task. I teach in a school where I have two different history classes, one Econ class and one English class, for me to sit down and create lesson plans for each subject in the manner that is dictated by the format would consume the majority of a day. If you have an initial TPA format at the beginning of the year which answers the majority of the questions in regards to the population that you are teaching and you then maintain your expectations of each lesson or group of lessons as you work your way through the school year. For the most part the demographics of your classroom will not vary that greatly throughout the school year, and if there is a major shift it is easy to update.
For the beginning teacher I do feel that this is a valuable tool but as you progress and find what works for you and develop your own system the TPA then is only a guideline and to ensure that you have your bases covered and your system allows you to flourish in the classroom.