The answer to the question "Does it lead to better play or stultify play?" is, of course, the ambiguous, "Yes."Interestingly, one of the oldest debates in RPGs (since it arose out of D&D) was the debate over whether rules enabled play, or rules discouraged play.
In other words, did additional rules in an area lead to better play by delineation, or did it cause players to be forced to work within the rules and thereby stultify creative play?
What we forget is that... different people work differently.Heck, the push-pull of rules and systematizing play is as old as Gygax and Arneson.
Some poets are their most creative when working in free verse. Others when working in sonnets. Some are best unrestrained, others best with a framework.