Good article, Daeds. I might try to hunt down the Twitter thread to see what else was said.
I saw someone (Hellie Ogden I think) say that 60% of her submissions either fail to meet the submission criteria (format, genre, basic spell checks etc) or are clearly at way too early a draft to be sent out. I was so guilty of this last with my first ever book (which will never see the light of day again). I did the absolute classic ‘I’ve written a book! It must be ready cos I wrote it all and did some stuff to it!’.
Also, my beta readers are the bestest. I am so lucky.