am181d
Adventurer
The two least helpful answers to a criticism of a new game are "it's too early to make that criticism, the whole game isn't out yet" and the typically hot-on-it's-heals "it's too late to make that criticism, they're not going to change it at this point."
I'm fully aware that the game is still in its early stages. If it were going to handle the theme/tone difference between heroic and gritty, /with modules/, though, you'd expect it to open with one or the other (or a mushy compromise between them), with modules to adjust it forthcoming - /not/ prescribe one set of levels for one and the rest for the other. That's neither modular, nor setting up for later modularity.
You're complaining about a feature of the game that's existed for 40 years. Not everybody likes it, but the gritty-to-heroic transition is the default (read Starter, read Basic) setting of the game.
And you're complaining about a lack of modularity in the Starter/Basic which are not intended to be modular. We have already been given examples of modules in the DMG that address the gritty/heroic balance (Vitality, variable recovery rates, etc).
Patience, padawan.