I've been seeing people post all the time that dragonborn need a high con to make effective use of the breath weapon.
I'd like to pose a different way of looking at the problem.
Take your dragonborn fighter. If you maximize his strength, that stat will be used for the attack roll for the breath weapon. If minions are the target, then the damage roll is irrelevant.
In fact, if several minions are engaged with the party, and the dragonborn has the opportunity to use the breath weapon but will also catch party members in the blast, a low constitution will be a bonus - less collateral damage.
I'd like to pose a different way of looking at the problem.
Take your dragonborn fighter. If you maximize his strength, that stat will be used for the attack roll for the breath weapon. If minions are the target, then the damage roll is irrelevant.
In fact, if several minions are engaged with the party, and the dragonborn has the opportunity to use the breath weapon but will also catch party members in the blast, a low constitution will be a bonus - less collateral damage.