In fact, other engines can provide enormous opportunities... This is a free camera, various light sources in real time, but in words it already sounds insanely expensive. And this still does not relieve us of the need to write a script and make models. We need to retrain, perhaps expand the team and much more. NLT knows its capabilities and runs on a platform that can offer gameplay and can present scenes beautifully.
Such changes are very risky and will not necessarily be successful. I can't remember anything erotic and successful on modern engines.
There is one game in space about a captain with panties on his head (you probably guessed it), but it also has its limitations, a team of people, good support at the start, and a stubborn zeal to see the project to the end..And they didn't have to jump between engines.
I'll leave it up to you to decide how good that other game is. But I will say that in terms of the camera angle, the staging of the scenes and the sexuality of the girls, they cannot compete with NLT.