Sure but big budget quality TV can be done (Game of Thrones, Andor) is just that the story/script needs to sustain an x amount of episodes. I don't think special effects are a problem per se with Marvel Studios series (I for one think She-Hulk looked amazing) but there's not enough plot, they tend to stretch things out.
But see, they have these blockbuster movies that they plan out years in advance. Its not really similar to Game to Thrones who haven't ventured into the movies yet. There hasn't been a Star Wars movie since 2019.
Also, yes, Marvel Studios has a habit of stretching out a story for 6 to 9 episodes, that could easily be told in a 2 hour movie. But outside Marvel, I've seen many serialized shows that do the same thing and nothing really gets resolved by the end of the season.
Budget would always be an issue when it comes to these shows, because if they venture to other story arcs that would feature other location and supervillains/superheroes that would only appear in 1 to 2 episodes, that would really increase the budget. I can't see Marvel Studios doing a live action X-Men series, with 9 episodes, that would feature the Sentinels, Morlock tunnels, Savage Land and Asteriod M, and dedicate a two to three episode arc for every single of them and not look cheap with a $200 million budget for all episodes combined. And who really wants to see that when you have these blockbuster Marvel movies coming out every 3 to 6 months anyway. Even if people watched season 1, there's always a risk of sophomore slump and losing viewers for the follow up seasons.
live action Tv is just not ideal platform for a lot of Marvel ips. Even Daredevil imo, felt lacking in spectacle. And I always wanted to see more comic book characters during the first 3 seasons of the show, rather deal with Fisk 90% of the series.