Those shows most definitely assume prior knowledge of the universe. That said, having avoided "superhero movies" for years (due to not being impressed with rand

Those shows most definitely assume prior knowledge of the universe. That said, having avoided "superhero movies" for years (due to not being impressed with random one-offs that I watched), I finally bit the bullet and watched the whole set in order with my kids and it made a huge difference, with enormous payoff in Infinity War and Endgame. FWIW, I think both WandaVision and Loki are fantastic.