From one point of view, if the fish is going to end up in your frying pan, what difference does it make what hook you use. But these days, as fish conservation becomes an increasingly important topic, I just don't think treble hooks are the best choice. Long time ago when fish stocks were plentiful this might not have been a concern. These days backing away from treble hooks is the least we can do to help out mother nature. Treble hooks have had their place in history, but that's about it, they should be history.
People use treble hooks up north in BC all the time, whether it's fishing for pike or walleye. For pike, they can have an advantage because their bony jaw makes it a tiny bit harder to get a good hook-set, and the 3 prongs offer a better chance that the fish will stay on the hook. But people fish for pike on the fly all the time as well, and if they can haul in big pike on a single barbless hook, this just proves that it can be done.
I don't think the regs actually specify a 'single' hook for the lakes. I guess this leaves room for personal preference, but practicing this courtesy can help you learn a lot about humility.
Sorry, I didn't mean to make this sound like a lecture... just a point of view.