Maybe they do, maybe they don't. However, it is absolutely one of the ways in which they're making martial characters more attractive in 5e. There are only a handful of ways that a spellcaster can boost their damage, and that all comes from their class features, and one feat that raises damage by an average of 1.3 per fireball.Do martials need some way to spike damage? They already do the most damage. Fighters have Action Surge to boost damage. Paladins Divine Smite. Rogues have Sneak Attack for higher round to round damage. Barbarians get a damage boost with rage and they can take damage better than anyone. Rangers are a little weak, but have a few things like Hunter's Mark and Colossal Slayer.
Martials do better round to round damage than casters. Spells don't boost it a whole lot unless we're talking the single 9th level spell a caster gets. Fireball does 8d6 or 28 points average damage in a round. 14 if you save. Spells don't do a lot of damage either. Casters don't get many caster slots. Consumables are rare.
Not sure the martials do need to boost their damage with feats as well as class abilities. They're already quite far ahead of casters in damage. Sharpshooter and Great Weapon Mastery only make that gap much, much wider given casters don't have a lot of ways to boost damage, no feats and very few class abilities (save for the Sorcerer).
I don't know if its an overreaction to caster dominance of 3e or what, but there it is. Martial characters get a lot of ways to boost damage - magic weapons, spells, feats, racial abilities. When taken together and mixed, it ends up as pretty strong.
Of course, by that same rationale, I don't think that any one piece is a problem, but the group as a whole. Or that's been my experience so far.
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