For all the talk of flatter math, they've just replaced attack bonus bloat with hp and damage bloat, which I think is even worse.
I think there is plenty of room for debate here.
With flatter attack/AC math and larger damage/HP spread, a kobold is never a life threat to high-level PCs, but is always a penalty for them (by grinding their HP a little).
Consequences of this are that tossing a kobold into an encounter always makes a difference, small but totally under control, hence you can (if you want) still feature kobolds in your game at all levels. Second consequence, lots of kobolds together can become also a large threat (but here I want to see how they manage to make the encounter easy to run... probably mob or swarm rules at some point).
The opposite approach: large attack/AC spread and small damage/HP spread. This leads to kobold forever being a life threat (they can kill you in one or few blows) but more and more rarely (need a roll of 20 to hit).
Consequence is that probably encounter design is more difficult... if you toss a kobold or two into a high-level fight, it's not so easy to predict their effect.
However D&D was never this second case. There has always at least be a large HP spread (even in old D&D, although HP at some level go up very slowly, but still this is only after level 10) so typically both the attack bonus/AC and the damage/HP spreads have been large. WotC just wants to avoid having this because it makes monsters obsolete early in the game.
It's okay for the fighter to get a damage bonus. It's not okay for a fighter to do 4x (or more) as much damage per hit as a wizard or cleric.
In a combat-centric game yes, especially if combat is usually reduced to attrition, but on a game that features the other pillars on par with combat, or at least a game where combat is more dynamic and damage is just the simplest tactic but often not the best, then even a 4x damage output can be fine.
I wouldn't have a problem with such large numbers for ED, if it was only the Fighter: it's the most combat-focused class so it allows someone to be extremely good at fighting at the cost of lacking in everything else. I am instead not so much in favor of damage boost to spells and abilities of all the other classes.