Really? I never enchanted for Gain Attribute. Seemed useless, especially when there were things like Shield, Fire Resist, and Feather around.
In Morrowind, at least, I never bothered with feather enchantments as you got more additional carrying weight for every enchantment with fortify strength than with feather, not to mention you do more melee damage, and I never used shield enchantments in Morrowind, though mostly due to the ugly and distracting effect for shield spells rather than their lack of usefulness, the only one of those I ever used in Morrowind was fire resistence.
Now, in Oblivion, things might be different, though in Oblivion I made fewer custom enchantments anyway due to the rather poor decision to limit enchanting services to those who gain access to the Arcane University, usually for Oblivion, if I wanted an item enchanted, I'd prefer to just use sigil stones, so I had to stick with whatever effects I got that I could use, and in Oblivion, I was quite willing to use shield enchantments, in fact, some form of shield, weather through enchantments or spells, was something I'd never go without if I chose to make an unarmored character.
But anyway, I don't see Skyrim's addition of perks reducing the usefulness of items, because perks in Skyrim aren't reallty like perks in Fallout. What Skyrim's perks do is allow you to further specialize within a given skill, like say, under one handed you might have a mace perk which makes you more effective with a mace, I see no reason why that should make any sort of equipment obsolete, perks are idependent from equipment and may improve your abilities to make use of your items.
Though in Fallout 3 I didn't really find myself being less inclined to use powerful items due to perks either, after all, I might be able to have a certain level of natural armor with perks, but by combining said natural armor with the defense from a good suit of combat armor made for an even higher defense, the only items which I felt could really be rendered useless by character abilities were ones which raised skills or attributes, such as power armor, since you couldn't go over the cap even with these items, so if you already maximized those skills or attributes, there would be no point in using them, of course, power armor was never really that good in Fallout 3 anyway.