My experience is the opposite. New players can't always make sense of a character sheet, but they know how to engage with the fiction. If I compare years of teaching new players D&D, versus more recently using Shadowdark, when playing Shadowdark with it's sparse character sheets they are more likely to come up with creative plans. If they are looking at their character sheet it's probably at their equipment. With D&D they keep looking at their character sheet and tentatively asking, "Can I....?"
Yeah I think part of the problem is systems that focus too much on "character build".
EDIT: The "consequence" of putting a 6 in a stat is that (in some systems) you get a 10% penalty to rolls that rely on that stat. That's it; that's all it means. If somebody wants to choose to roleplay that stat as being more meaningful than a 10% penalty, that's entirely up to them. But I find attempts to arbitrarily impose additional constraints, "...and you are especially bad at X, Y, and Z...." to be, in effect, dictating to people how they should roleplay being 10% worse than average at something, and I don't agree with that.