Cosmic Descryer lets you throw extra HD onto things you could get with Summon Monster, Elemental Swarm, etc., it doesn't let you summon anything you want. Likewise, Gate doesn't let you screw around with anything that's some flavor of deity, which is almost anything to begin with... so it doesn't need any adjustment. Its mostly a way to ensure summons scale.
Anyway, I don't consider using summons and using constructs to be "optimization," all divine portfolios have some provision for summoning or constructing allies and so it can hardly be described as an unintended function. I was likewise not implying that WotC material constructs are on par with IH ones, but that constructs and summons are a really really useful part of a spellcaster's strategy... especially if one of your portfolios gives you a bonus to either. In particular, they're going to help out a lot against enemies that need to be killed in one round, that you only have a 5% chance of harming, or any given being can only harm once.
Considering the most iconic (or at least, constantly posted on image boards) IH monster is itself a neutronium golem, there's no reason to think minions ever go out of style. There's also the issue that the really, really powerful undead of IH are likewise nice at high tier comparisons too.
Anyway, I don't consider using summons and using constructs to be "optimization," all divine portfolios have some provision for summoning or constructing allies and so it can hardly be described as an unintended function. I was likewise not implying that WotC material constructs are on par with IH ones, but that constructs and summons are a really really useful part of a spellcaster's strategy... especially if one of your portfolios gives you a bonus to either. In particular, they're going to help out a lot against enemies that need to be killed in one round, that you only have a 5% chance of harming, or any given being can only harm once.
Considering the most iconic (or at least, constantly posted on image boards) IH monster is itself a neutronium golem, there's no reason to think minions ever go out of style. There's also the issue that the really, really powerful undead of IH are likewise nice at high tier comparisons too.