That's not true, beam jumping can be very helpful. Hasn't anyone tried holding a direction in additiong to jumping? You can go flying backwards, which is really useful for getting out of tight situations. If someone is swooping in to melee you and you are gonna get killed, charge up a generic beam (the best for jumping, you can keep going for as long as you want), shoot it at the nearest wall as soon as it's ready (not fully charged, that's a waste), and hold jump and back. You'll go across the map faster than they can follow you, and will have time to get ready.