When I had family involved with the union, they would routinely vote on implementation, which was passed to the school boards before approvals.
They absolutely had a say, especially the teacher from the article who had hours of curriculum become useless overnight, should have spoken up.
from the first article linked
“I may very well be in jeopardy of not being able to use it and my entire curriculum is based on this,” Solin said. “I’ve spent hundreds of hours developing my curriculum, iterating my curriculum, finding out what works what doesn’t work. ... Part of me wants to just not reach out because I’m scared to find out what the answer is.”