I think the logic for the Institute suit is that the Institute very rarely sends personnel aboveground, and when they do it isn't to radiation itensive areas. Since they mostly use it inside the 'tute itself, it doesn't make much sense to have it made that protective since they're always short on resources.
As for the diving suit, despite its uselessness as a quest reward (most likely the player will already have the Aquaboy/Aquagirl perk by the time they get it), it also makes sense since it is a pre-war item.
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As for the diving suit, despite its uselessness as a quest reward (most likely the player will already have the Aquaboy/Aquagirl perk by the time they get it), it also makes sense since it is a pre-war item.