I'm sorry but I heavily disagree of why everyone is disappointed.
I don't understand how meaningless cameos & easter eggs would've progressed this story when it's just about Scarlet Witch. You don't create a whole show or a whole film just to set up a whole other film or show. Great examples: BvS, TASM2, "X-Men: Origins - Wolverine", "Fant4stic", etc. You focus on 1 narrative & that's exactly what this did.
The theme of the her story is that you can't get what you want even when you have the power to do so, especially not without consequences. They never said that this was supposed to open the multiverse. The ending was great & I'm glad it went in this direction. "Wanda/Vision" is great & can't wait to see her influence on "Spider-Man: No Way Home" & to see her again in "Dr. Strange In The Multiverse Of Madness".