Except, traditionally, the Listener takes longer to solve than the Times cryptic. If it doesn't then, de facto, it concedes the prestige of being the most difficult newspaper crossword, a claim which is already in doubt.
We know what the Listener editors are doing. In an attempt to boost a dwindling number of solvers, they're publishing quite a few very simple puzzles. It's a question of balance. This year there have already been perhaps 4 or 5 which take little longer to solve than the Times cryptic (which itself has been watered down over the years to a coffee-break puzzle).
So you attract more solvers, but what ultimately do you attract them to ?