It certainly would have been easier to find a particular issue
You mean nobody else keeps their magazines filed in chronological order with each year in a separate cardboard holder. All walks cross referenced by area, duration and total ascent? You'll tell me next that nobody ensures that their OS maps are put back in the shelve in numerical order. ;-)
I do prefer perfect bound as the cover and centre pages have a habit of working loose on current format. However, I don't think it's an issue effects whether or not people purchase the magazine. So it wouldn't be worth increasing printing costs for it.