the marketing was based around "It takes two" and they pushed it as more of a collabo than just Antman 2 (with more Wasp)I haven't watched it, but if its because of Wasp, then I think that's a bit different. It'd be like if Shuri got a suit and BP 2 was called "BP and Shuri". or if IM 2 was called "IM and War Machine" (more or less)
I'm talking more of a popular character (or multiple) from other franchises are coming in.
but still you're right in the sense that Wasp didn't bring her own franchise to this movie like Iron man and Cap did with civil war, or Thor and Hulk did.
Although (slightly off topic) I would rather see a solo Wasp movie than an Antman movie. She brings alot more to the action scenes. Maybe they should've given her a franchise.