it's not pointless, all small edges must be pushed in all forms of tournament play.
in PLO pre-flop edges are small, so raising for 'value' isn't easy pre-flop, since even super-strong hands are rarely more than 70% over a junk hand.
but that's not the only reason we raise... we do it to take initiative, to isolate weak players, and occasionally buy position (which is not easy when so many will cold call any four cards in behind you, but position is important in all 'button/blinds' poker vairiants... so push that edge).
later in tournaments its easier to raise for value because of the changes in blind

tack ratio's, and you'll often find it easy to get in >1/3 of your stack with strong pre-flop holdings.
in the early stages... if your only goal is to steal the blinds, then yes raising is pointless. but if you have a broader objective... then it's essential.