i'm pretty sure there are some who wish that mc and mom would continue from where they left.
There are, but that's what I mean about them not getting the point of this story. It's about Mia, it's always been about Mia, or at least it's about the relationship with Mia. It might not have started off in the best of ways, but it developed and evolved into romantic love between the two of them. Even when the MC was bonking his Mom, he did love Mia, but he stupidly wanted more and thought he could have more, and that youthful arrogance cost him.
Now it's all about reconnecting with Mia and trying to figure out if those feelings are still there, and they'll either find that they're so real they'd be willing to cast aside everything to have this taboo relationship, or it was real at the time but the feelings have faded and they no longer feel that strongly anymore. Or the third option, that they do still have feelings but accept they can't be together and resolve to put those feelings behind them and move on with their lives. Of course, I'll be going for the first option and believe that it will be considered the canon ending by the devs.