A game is better balanced the more choices it presents to the player that are both meaningful and viable.
Humor me for a second, and explain how it's not important to present the player with choices?
Is it your position that an RPG with no choices is just fine?
Or how is it not important that those choices be meaningful, or that they be viable?
If I'm playing a champion fighter it's likely because I want to play something that's simple from a tactical point of view in combat. There's a lot of reasons for that, for some people running around hitting things may be all they're interested in or feel they're capable of. For a lot if people too many options and choices, especially ones that need to be made fairly quickly is stressful. For me, I DM a lot so it's kind of a nice break. Figure out what critter we're focusing on or which one I need to distract and have at it.
Outside of combat tactics I can still have a fair number of options, contributing to RP, decisions and other challenges pretty much as much as anyone else. I've never needed to be the best possible in order to contribute meaningfully on a regular basis.
People like simple because complex and/or more choices are not as enjoyable. Simple is relaxing and fun and it can leave more head space for getting into character if you value RP over tactics.