For the most part there is nothing wrong with this, as long as it is done with proper investigation and the practice is found to be useful, or not. This was one of the things the Buddha advised others to do, and welcomed all to see for themselves whether or not his system worked as he said.
In the suttas there are numerous occasions when the Buddha refers to his system as Dhamma & Vinaya or Teaching and Discipline, and the origin of the rules can be found throughout the Tipitaka in all the surviving lineages. These may have some differences, partly due to cultural circumstances, so minor rules needed changed and partly due to translation errors.
It should be remembered that when practicing the teachings we are implementing the Vinaya, taking hold of the tools needed to fully practice the Buddhas teachings to submit ourselves to the necessary code which is complimentary to holding the practice upright, and not let it degrade within ourselves.
The Vinaya is about practicing the Dhamma fully, not continuing with worldly affairs and focusing on the things which are not the teaching/s. the practice is the practice not just the parts we like.
At the end of the day I may be right, I may be wrong, but I share this hoping I am one, the other or both.