A note that i meant to make some time back, but then forgot:
some weapons are supposed to be restricted to certain races because of size/inclinations. in particular small creatures like, halfling or goblins and to an extent dwarves are not supposed to be using large weapon designed to be used by larger people, or that are heavy and bulky. if they do so they would use them at a disadvantage, since they wouldn't have the strength, height and arm length.
so in principle the goblins would have not be using longbows but shortbows (this is not meant as a criticism of Raven, just a learning moment, as i said many times, the DM is in charge of this world and if the goblins used these longbows proficiently, it simply means they could. No need to go back and change stuff. maybe they were particularly well-trained, or tallish goblins)
Both me and Veit picked up the longbows (did he get also the goblin's arrows? how many?).
I can use it without disadvantage and with proficiency (it is a martial weapon), although i prefer strength-based weapons like the javelin (+3+2=+5 modifier) than dexterity-based ones like the longbow (-1+2=+1 modifier).
However, Veit would use it at a disadvantage, without proficiency, and with a negative dex mod, which hurts him a lot (-1+0=-1, for the longbow). If he picked up a shortbow instead, which he is proficient with, he would have -1+2=+1 as a modifier to hit, and no disadvantage.
in addition, Veit already has strength-based medium-range weapons, his two throwing axes, which give him (+2+2=+4 modifier), so these should be his ranged weapons of choice
of course if it hits, the longbow can procure more damage (1d8+3) than a shortbow (1d6+3), javelins (1d6+3), or throwing axes (1d6+2) and have much more range.
in short, the only reasons for us to use our new longbows are if:
a) we used up our other ranged weapons, like the 3 javelins or the 2 handaxes
b) we need more range
c) for Veit, if he needs piercing vs slashing damage
d) we need to maximize the amount of damage vs lowering the chance to hit the target