I'm sorry that you came away feeling that it was useless. The message you were meant to come away from this was that everything happened, so every romance is canon, everything that could have happened did, but the true end converges it all onto one point.
Maybe useless is not the right word to describe what i mean 😅 i'm sorry.
I'm just surprised, Dave immediately choose him to be his boyfriend in the true ending after he became boyfriend/husband to all of his friends in other routes / paths. I thought he will have complicated feeling, like "who will i choose to be my boyfriend?" Because... if all romances in every routes is canon, i assume now he will have love feeling to all of his friends 😅 the other theory i have is : Dave immediately choose him to be his boyfriend because Dave is afraid, he will leave him forever if he not choose him.
Also, i forgot to ask, how about Memphis in the true path? Is he still go to the mansion after that? I imagine he, Dom and Jack still come to the mansion looking for the time machine. Then he will see the vault is open, he will angry and searching Oswin. Maybe he will kill Oswin 🤔