Rules are the foundation for freedom. If you have rules, you know your capabilities and you are free. Without rules you are ignorant of your own skills.
There is no opposition between roleplaying and rules.
This is, in my opinion, the premise behind the martial/caster debate. The reason why casters are good is because they have freedom, and they have freedom because they have rules. Nobody argues that caster players cannot roleplay because they have lots of rules.
Rules are freedom because they provide a baseline of competence. A character who has an ability that says he can jump 50 feet is freer than a character who does not, because the character who does not have it likely cannot jump that distance.
Each ability that says you can do X is an assertion to that fact. It cannot be taken away. It does not rely on negotiation. It is a concrete thing. Liberating.