I once read an article on T-Nation arguing that periodization is not necessary for non-competitors although I realize that's not the only reason to periodize.
Although this may be a dead horse, I have still to ask and never saw a discussion on this. I personally don't care about periodizing. I'm not that strong but I thought I should say as much. I use microplates (adding as little as one pound to the barbell at a time) and may occasionally opt for extra reps instead of extra weight but the concept of speed work or this or that (hypertrophy, strength etc.) season has never seriously occurred to me. I'm also pretty sure that SOME of the best oly lifters of the past did not periodize.