Stat items in 3.5 ed is one of those third ed problems that I dont think was really a problem. The problem was that ability buff spells were such low levels and gave a pretty noteworthy bonus. The items themselves only required a fairly conservative approach from the DMs to stop PCs getting items with too high a bonus.
I think the real issue was that everybody wanted the big 6, and players would only consider acquiring other magic gear as an afterthought after the basic stat boosters had been settled. It made them somewhat boring and predictable, every PC is going to eventually want (and ultimately acquire) a cloak of resistance, ring of protection, amulet of NA, +x shield (animated and/or made of mithral as necessary), and stat-boosters corresponding with their key stats, regardless of what their build comprises.
The only exception to this I saw was a player who played a barb that dumped AC, and focused on effects that punished the enemies for attacking him.
Stat bonus items aren't any more "flavorful" than the "1/day, do something cool", and are possibly a lot less so. The 4e gauntlets also give a boost to Str and Athletics, so a good roleplayer has some room there as well.
Why do I need them to be flavourful?
You won't see Batman dropping his utility belt and replacing it with a girdle of giant strength to throw people around with it. You won't see Ironman giving up his suite for another one he found on a dead super-villain.
One issue might be that they never really found equipment worthy of replacing their existing gear with. Batman did eventually soup up his batsuit with all sorts of fancy abilities (in Batman Beyond), and if he found a belt of strength, he would likely find some way of combining it with his utility belt (something like the new pricing rules in MIC). In one episode, he also had this suit of armour that did the fighting for him. So he really isn't above this.
Likewise, I think that if IronMan encountered a superior suit of armour, he would not hesitate to incorporate its design into his existing armour somehow. Power is power, regardless of where it comes from (so long as it does not violate your own personal code/ethos), and you are routinely engaged in life-and-death struggles with supervillians. So it makes little sense to forgo such power simply to "look cool", because "being cool" doesn't save you from an enemy's attack. Cold hard stats do that.
