I made a Githyanki wizard that doubled as a fighter that was pretty fun. Greatsword proficiency from being a Githyanki, pumped Strength to 15 so that I could take the Heavy Armor feat to make it 16 at level 4. Still had a respectable 16 INT for casting.
Once we get some proper plate it'll make for a VERY tanky wizard who can also hit hard in melee.
So ... basicaly Eldrich Knight without Action Surge?
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Personaly i belive that bigest drawback for Mid or Heavy armor Wizard is loot ...
Somehow i kinda dpubt that Larian would create magical armor that would strongly benefit Wizard ... cloth robe seems more logical and natural choice.
