I had some dealings with one of The Listener editors a long time ago, he had little or no skill in this particular subject back then and was concerned about the level of difficulty involved if solvers were expected to follow its rules to a conclusion. This doesn't appear to be a general problem, because solvers are routinely expected to apply mathematical rules, origami techniques and a wide variety of 'rules of the game' to Listener puzzles - and for those of us who can't or won't, we just accept defeat.
Why this particular subject (one that's been around for many thousands of years) should be the exception, I don't know. Just about every time it comes up it's a 'classic' of sorts, so a little research is usually all it takes to arrive at a successful conclusion - and even that wasn't expected this time, because the conclusion was spelled out for us. My opening comment referred to this, and the fact that a careful reading of the preamble made it possible - for me at least - to know exactly what the final grid would be (with the very minimum of research required).
I said at the outset that I thought it was a well worked puzzle except for the flaws that spoilt it for me but, as everyone posting here seems to be oblivious to either of the flaws I hinted at, we might as well leave it there.
However, the kind of endgame we see in some daily newspapers, week in week out, can be adapted to a Listener crossword (I know this because I constructed one that at least got to the first stage of the vetting process) and I would like to see one appear... eventually.