Thanos uses a gauntlet because he is selfish, but if the Infinity Stones are to be shared than a mech-suit style armor is a way better choice.
Thanos, Marvel: Ultimate Alliance Wiki
Thanos (Earth-199999), Marvel Database
New 'Infinity War' Theory Excellently Breaks Down How The Avengers Could Undo Thanos' Snap - BroBible
Thanos Collider
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After watching what happens when Thanos powers up with all 6 of the Infinity Stones, wouldn't he notice them missing when Tony stole them from the gauntlet? - Quora
Why doesn't Thanos need armor in Avengers: Infinity War? - Quora
Ultron Is More Powerful Than Thanos With the Infinity Gauntlet
Archive ScreenRant