swallowed For a professional to be truly professional there needs to be honesty, transparency and integrity. This includes admitting assessments are not fail-safe, as your post suggests,
"there's no real quantitative way of assessing education - it is ALL qualitative really, it all requires opinion, consideration, interpretation etc. even later when marking exams against mark schemes. that is just reality."
Professionalism would also include genuine, respectful, consultation with parents, since they hold a lot of information about their child. This should be a priority above protecting the profession, in order to be truly professional. Is it?
Parent involvement does not stop at raising money for the PTA or volunteering or supporting homework. They will, justifiably, see cause for criticism sometimes, since no -one is perfect.