A final thought: people have different amounts of time they are able or willing to devote to crosswords. In my case it's no more than 5 hours a week, so I employ any aid that reduces my solving time, except other people. But I have dim recollections of a housemaster at Eton in the 70s called Bobby Bourne, a classicist who was a Listener aficionado, who considered the use of a dictionary to be cheating.
"O tempora! O mores!"