FarBeyondC
Explorer
For whatever reason...
According to Sage Advice, they intentionally gave what they considered feats with narrow use (explicitly mentioning Great Weapon Master and Crossbow Expert) at least one benefit that could be applied more broadly. For Crossbow Expert, that would be the ability to make ranged attacks without disadvantage for being within 5 feet of a hostile. For Great Weapon Master, its the ability to make a bonus action melee attack when you critically hit or reduce a creature to 0 hit points with a melee weapon. For Sharpshooter, its the ability to ignore half and three-quarters cover with ranged weapon attacks and make said attacks beyond normal range without disadvantage.