In an RPG you're trapped by the experience system and all the stats associated with it. You can't go to some places or fight some enemies because its too high level, you can't do some things because you're not strong enough, you can't pick some dialogue options because you're not charismatic enough. That's not freedom.What is the difference between that and a locked door not opening up unless you have the key?
You have freedom but that freedom only means you have the potential to do things, not that those things don't require prior planning/setup.
I don't really like a lot of rpg systems but I've never thought of adventure games having more freedom.
