Sure, but presenting the setting is NOT writing the rules for making PCs. You can have legolas elves and gimli dwarves in your setting even when those tropes are mechanically poor for them.
Right now, elves and dwarves are getting weapon proficiencies and armor proficiencies that make them legolas-like and gimli-like even if they don't choose fighter as their class (and it probably doesn't have any effect on character classes that don't prioritize the appropriate stats). The thing is that this only really helps world-building, and if you're world building, you just make more dwarves and elves fighters, you don't worry that the elven potter doesn't get longbow on his list of weapons. As long as the generic monster entry for 'elf' gives him stats for a longbow, elves will be typically armed with bows.
So given that, it matters not a whit if you let PCs choose where their +1 and +0.5 stat modifiers go. They could always have bucked the stereotypes, and now you just make it less painful... and it doesn't change your setting one little bit.
