To be honest What ifs scenarios are destined to be proNTR. Whatever people are saying each chapter have only 2 NTR scenes. So thats mean its easier to make WhatIf with Hunter.
I mean. Imagine you want a threesome with MC and both Brenna and Catherine. Welp, we will propably get it in future in the main storyline. So we don't need what if with them.
As for why Dev doing that... Because he can? Because he is making money and work hard for that? Because its funny? I actually don't care. Main point, he is doing something. So, i know that i will get my game, because dev still have fire in him. Unlike others, who only got excuses.