The last season was definitely phoned in. It was like watching one of those movies in which the studio insisted a movie end a certain way. These are usually referred to as "tacked on endings". The 8th season of GOT seemed like a hurriedly tacked on ending. Nothing was well thought out, coffee cups and water bottles were left on set, Daenerys' forces multiplied faster than the Night King's, etc. D&D did a great job when they had source material to work with. They weren't so good at winging it on their own.
I even wonder now about the scene in which Daenerys appeared with Grey Worm and a pitiful small host at King's Landing for Missandei's execution. Did she really have such a small force, or were they merely a small retinue? I wonder if her entire mass-reproducing army was meant to be there, and they just didn't take the time to CGI them in place out of sheer slovenliness?