Of course not, but being 'nice' shouldn't be confused with being a pushover or not being ambitious or determined.
Sure, but being a bit shy/awkward/humble/unassertive/quiet doesn't make someone a pushover either.
With all those together... I would say it might.
These are traits that generally go together. And at a moderate level, they aren't flaws.
Well, awkwardness and unassertiveness certainly aren't
positive character traits. I'm not sure how shy, awkward unassertiveness doesn't lend itself to being a pushover.