Multiple MCU series have had weak endings due to the studio's fast expansion and the need for flexibility in future plans for characters.
The finale of WandaVision, despite its success, suffered from unresolved plot threads and a rushed conclusion, highlighting ongoing issues with MCU show endings.
Marvel Studios is now taking steps to improve the quality of its TV output, including hiring showrunners, suggesting that future MCU series endings should improve.
That makes a little sense. It's shocking to me they didn't have showrunners already. Honestly, it's not just their shows either. Basically everything since End Game has had an enemic third act.
The first three phases had a cohesive story and a planned direction. An endgame, if you'll allow it.
They were trying to set up Kang and the Young Avengers, but while the Multiverse provided creative license to include whatever characters and stories, it diminished the purpose of each individual story. The spiral of characters and interconnections has become untenable, and opaque to the casual viewer.
Is Man-Thing going to show up as a Nexus Being to host a fights between Skaar, The Black Knight, Fin Fang Foom, Hercules, and the Ennead for control of the Necrosword? Maybe we go afterlife hopping from Eternity to Valhalla to Djalia to Duat to the Dark Dimension with Ghost Rider and Madisynn King? There are too many people, places, and things to track, and it doesn't seem to be leading anywhere but a massive retcon.