So agree- communication, communication and more .... OH had an excellent Grammar School education (Woking Grammar, anyone here?)- and did O'Level French, but could NOT string 2 words together! My first head of Dept when I started teaching in the UK was a O'Level Chief examiner from one of the O'level boards, and could not speak French at all- but he knew every single bit of intricate French grammar, and insisted on teaching the past subjunctive to all, saying it sorted the sheep from the goats! He did have to leave when it was evident that his French communication was zilch, and ended up in a private school.
It's a bit like learning to read and understand music theory, and not being able to play or sing at all.
I grieve here as I teach youngsters on both sides of the border- where from a young age, learning a foreign language is all about writing, vocab without context, spelling- and no communication- with marks given almost exclusively for writing (not communicative writing even).