Because such utility items are not about dealing damage but mostly about changing the distance between yourself and your opponent.
As such a utility item with 2 uses and no or only low damage is more useful than the remade version with medium damage but only 1 use.
That would be the case for hooks and teleporters.
As for shields - you change some hp damage into energy damage.
HP damage cannot be restored except for by luck with random boosts during campaign.
But energy recovers during battle and restores fully after battle.
So those shields could make campaign and raids easier and PvP battles harder.
Push weapons from range 1 with a push of 3 spaces would allow ranged mechs a better chance when starting from range 1.
So all these legacy items still find uses and advantages that the current items do not have because the “new versions” right now miss the important features of the legacy items.
Edit: That is also why it is annoying for some players to fight those legacy utility users.
E.g. you plan fighting as ranged mech against a close-quarter combat mech.
You make him use teleport, charge and hook and believe to have won.
But then the opponent uses the hook again.
That is because the hook’s important point is number of uses + changing range and not dealing damage.