I don’t always see eye–to–eye with DHH, but damn it if he didn't hit close to home with this one.
Grit is a convenient trait for enticing others to comply with the uncomfortable or the uninteresting [Ruben adding: or the untenable]. It elevates the perseverance of such adversity to a virtue in and of itself. Just dangle that long-term goal in front of them, accuse them of lack of grit, and compliance will oft follow.
But far more important than to be capable of suffering for your cause is to ask “what cause”? Am I the beneficiary here, or is someone else? Being high on grit may well mean sticking with a faulty cause for far longer.
Grit is an optimization for local maxima. If you’re able to change the function, drop the grit.