It is just simply not in the design. Games like this are not designed to allow you to have everything at once. You have stock strike and gut, both pretty strong melee range and a ton of armor, you have a few DPS skills as a vanguard that are pretty much melee range but must use a gun.
Last time i will say, Scoundrel can do both and gets the nifty stealth generator and delicious scattergun backstabs while still retaining it's mid range options.