I would recommend parishes to conform to the guidelines of EACW because I find it truthful, more than from the recommendation of the NCCB in 1986. The history of the church is replete with examples of people who struggled against the status quo on controversial issues. The status quo used to be that one had to first become Jewish in order to follow Christ. That hasn't been true for 1950 years. It is part of being a vibrant church.
Leaders can change their minds.
It is a sign of strength, especially when a change of heart is well-reasoned and prayed through. Today, people are forcibly evicted from religious communities, denied orthodox ministries, even refused communion because of what conservative elements in the hierarchy believe they are intending with their innermost conscience. I have no problems with conservatives per se, except when they play at being God. People continue to be punished unjustly for presenting progressive ideas. Some like Aquinas or Congar will see future vindication.