Honestly, I don't particularly care about how thrown weapons were so inferior to bows and such. This is a game, things are better balanced, and it's cool. Don't know why realism needs to ruin that.
Its important because the image of throwing weapons can influence what people actually want out of the feats/class that uses them.
That in turn should be the basis of designing said feats/classes so that they match the image that the person who wants them has in their mind.
Of course different people have different images of what someone good with throwing weapons should be/be able to do:
Do they rapidly fling many weapons, drawing and tossing with both hands until their opponent keels over looking like a pincushion?
Are they more deliberate, dropping an opponent with each precise throw?
Do they walk around, covered in bandoliers of blades, or do they look unarmed right up until a knife hilt appears sticking out of someone's throat?
Are they a juggler, able to catch even sharp weapons out of the air?
Are they more combative, running to chop one foe then whipping their weapon into another out of reach?
All of these are concepts that people might want to realise when making a "throwing weapons expert" but some are different enough that they would require different, and possibly mutually exclusive options.