NOT a comment on any developer, but micropenis as a trope.
The problem with micropenis NTR isn’t that it’s a reflection of the MC’s flaws, but of the FMC.
It shows that she values the physical aspect of sex more than the emotional aspect. That sex is just for the thrill and less about forging and deepening bonds with your loved ones.
Stuff like foreplay, romantic buildup, intimacy are basically thrown out the window.
That, and micropenis is quite a rare condition. Making its blatant overuse a symptom of lazy writing. There are plenty of ways for MC to feel inferior to the bull besides employing the obvious dick size comparison.
When a heroine is easily swayed by things like dick size, it cheapens her eventual downfall. Thus lessening the corrupting aspect of NTR.
"She was a hoe all along, why did I even bother?"
Some may love this trope of exposing girls for the "sluts they are," but IMO I’ve always found this a bit basic.
It's much more interesting seeing a pure, naturally good person fall to the dark side by slow seduction.
That you two could have had your happy ending together, but some dastardly fellow wedged his way in and corrupted her. Delicious.