Yeah, it felt too much like it was neatly wrapped up and a bow placed on it.
No argument there. The scene in the library feels insanely rushed, especially after a whole episode building up to it. It gets even weirder when Episode 5 swiftly unties the neat bow while simultaneously providing a whole new set of incompatible reasons for why the threesome didn't work if the MC is on the friendship route.
I sometimes wonder if Episode 5 was originally meant to be the end of Episode 4. Not just that DPC split the story up because it got too big, but that he intended to end the first story arc with MC/Maya/Josy in a mutually ambiguous position, the DIK mansion wrecked, and the MC getting his jacket.
When he realized he was going to have to split the story, he faced a dilemma. If he simply split the story, he would end the season by resolving the cliffhanger on an ambiguous note. But if he restructured the story to fix that new pacing, he'd have to tear up his original outline and work out a whole new structure for Episodes 5+. So he tried to split the difference: he tacked on an overly simplified resolution to the Maya & Josy drama in Episode 4 to give a relative happy ending, then turned the remaining bits of his plot into a sort of bonus episode that could patch up the loose ends while still ending where the next episode was "meant" to pick up.
I'm probably overthinking it, but it would explain why we got an Episode 5 that feels like a minimal story padded out with gratuitous sex scenes and a low-grade retcon of the M/J threesome.