That is not true. Valve requires that you do not sell your games cheaper on other platforms, hindering competition.

Name one with purpose, then. There is the big cave with the boss. It is separated in two halves by a long ass platform. There are no enemies, exploration, rewards or challenges on the platform. The sole purpose of it is to make you run right and then left, instead of just facing the boss right away.

It is slightly worse then HK.