This is battle.net 2.0. Most of Battle 1.0’s functionality had to either be ported or just isn’t there.

Battle.net 1.0 is so different that warcraft III vomited server instability when it moved to 2.0. They’re the same in name only.

And as others have pointed out, it will probably still require 2.0 in order to play the games, just that Steam’s launcher will point you to battle.net