HEX, you probably don’t personally need the option to pick it up on Steam, but it works out for you in the long run. See, HEX on Steam means that new players will come into the game by Steam. That means more players in the game, which also means more players for you to play against. More new players to play against means the game does better, so your experience is overall better.
So you should be happy that the game is available on Steam right now for anyone who wants to try it out. And if you don’t already play HEX and like installing stuff on Steam… well, this seems like an obvious benefit, doesn’t it? Everybody wins.
Source: Steam page; thanks to Jan for the tip!