The problem with that is always people.

Because one person is judging that "terribleness" before being entitled to flame, changes to that person influence their ability to objectively make that assessment.

Say, when their project becomes popular, they gain more power and fame, and suddenly their self-image is different.

Hence it usually being a more community-encouraging approach to keep discussions technical without vitriol.

Flaming is unnecessarily disruptive, not least because it gives other (probably not as talented) folks a license to also put their worst impulses to text.