I feel you on the writers but a LOT of great Superman artists have talked about how difficult he is to draw, including Sampere.
Hahahahahahaha. My first thought was that it sounds like a riff on the very fun double date issue in his Batman run, but I can't deny that it and the Super Sons + Daughter thing are, like, "sings Sweet Caroline at karaoke" levels of straight.
Tom King is clearly trying his best but the poor man is so terminally a straight guy, and not a "my besties are women" straight guy like Greg Rucka. I'm not surprised he's finding Diana so hard to write - it's hard to get into the mind of an Amazon if being one of the girlies is an entirely foreign concept.
You're right that 99.9% of superhero comics are shallow as hell but he was speaking about how the balance is hard to strike visually. I imagine it's difficult to make a character look larger than life and muscular but still warm and approachable.
And man, Sampere hasn't missed even once with these covers. Gorgeous.