This game is reintroducing a variation of the musket, with some silly crank operated, single fire weapon. A weapon that would have been obsolete in terms of laser weapons before the bombs even got close to dropping.
If that silliness is going to pass, I can scarcely see how bows and crossbows seem unfeasible. Especially considering tribals that may not have been exposed to guns before (Dead Horses and Sorrows for example, if I remember right).
Also, armor was practical before Power Armor. The regular infantry was equipped with some armor. It may not have made them walking tanks, but it provided them with some protection.
Might as well add in some swords, a dragon, and call it the Elder Scrolls. But as you said, it is up to the player to choose what weapon they use. https://youtu.be/-3nYFn-aIno?t=3m48s But Bethesda ultimately decides what weapons Fallout 4 will have. Until the GECK is released you're stuck with what they made, then you can play with all the bows, and arrows you want. If you've got the knowledge and talent to model, texture, animate, script, and place such weapons.
You do know that the last few Fallout games had swords, right?