“Maximum on A4” when printed in 3-pt FlySpeck font?
While I agree with your general sentiments, I believe any limit should be a little more precise. Perhaps 1000 words or something like that?
That said, both storage and bandwidth are essentially free these days. A picture is worth a thousand words — well, costs more anyway — and the BAA is quite happy to host many thousands of images. No technical reason to be parsimonious; the judgement should be based purely on aesthetic issues. My opinion, anyway.