You may suggest that, but that's just not how armour works. Con ST don't matter for 10% of the time Dragonborn are impacted in combat through not having dark vision. Act 2 will bring A LOT more low light areas, anyone without dark vision is a liability. You can only artificially give dark vision to one person. So yes, that's not enough to save the Dragonborn. I'd be against a boost to all cha checks since, I'm sorry, but it just makes no sense to me. It reminds me of the argument that strenght should count for intimidation checks.
Like, what's going on here? You're taking my ideas in the worst light to just flat out shoot them down. None of my ideas so far have been especially eggregious, especially when, again,
they're just initial suggestions. Work with me, yeah?
It can be how armor works. Shield of Faith gives +2 to AC. Defensive Fighting Style gives +1 to AC. Shield gives +2 to AC. Actually, the Warforged (a direct race comparison) even get +1 to AC due to their armored construct nature.
Con STs are always relevant, as you never know when an enemy will cast an extremely harmful spell at you that requires an important Con ST.
For dark areas, you can always bring a light, cast the Light cantrip, cast the darkvision spell, or drink a potion of darkvision. By your logic, since humans and halflings will be a liability due to their lack of darkvision, should we give them darkvision too?
I didn't mean to imply that "all" Cha checks get a bonus. In the comparison example I gave, I referred to specifically Intimidation or Persuasion checks. We can also look at half-orc, who automatically gains proficiency in the Intimidation skill because of their race/strength/typical orc attitude. Why is this different than for dragonborn?
(Also, yes strength should be an option for intimidation. Bouncers often make use of this. People who can more easily do extreme violence to you are/can be more threatening.)
I'm not asking for humans nor halflings, because there's no saving them in this aspect. Halflings at least have lucky. That's fair. Humans? Rest in Pieces. Dragonborn might make the transition.
Yes, you can make up for everything in this game, but it costs you resources. That's all you will be doing -- making up for an inherent weakness. AC is not "armour" in the sense I'm speaking. Armour is the defense to your body. If you wear something with a higher armour than your natural defenses, that means it will be overridden. Warforged are an anomaly, because:
"Your body has built-in defensive layers, which can be enhanced with armor. You gain a +1 bonus to Armor Class. You can don only armor with which you have proficiency. To don armor, you must incorporate it into your body over the course of 1 hour, during which you must remain in contact with the armor."
Your AC proposition is most closely related to sorcerers of draconic bloodline.
"Draconic Resilience
As magic flows through your body, it causes physical traits of your dragon ancestors to emerge. At 1st level, your hit point maximum increases by 1 and increases by 1 again whenever you gain a level in this class.
Additionally, parts of your skin are covered by a thin sheen of dragon-like scales. When you aren’t wearing armor, your AC equals 13 + your Dexterity modifier."
Because of this, I would be lead to believe Dragonborn would work like sorcerers and not Warforged.
I'm not sure how species have no strenght advantage and yet an imposing presence via increased strenght can coexist. Even if I were to 100% agree with your argument, the conclusion must be "No, Dragonborn do not gain intimidation through their strength -- they have no superior strenght over a gnome". You would therefore be bluffing, which is charisma. Now, an orc or a Tiefling look very mean, which would likely help. Maybe. Hopefully. Who would think this could create borderline plot holes /s
Dragonborn are neither *especially* imposing, nor, more importantly, expressive. This is why I disagree that they should be the class to get the highest charisma benefits, as they also have natural disadvantages. They might end up with a boost to deception or lesser intimidation... but that's again not enough and also just mimicking other species. If Larian were to be thorough, they should pick something that properly makes them special.
