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The honest answer: it depends on whether you care about the full story or just the blockbuster moments. The MCU has split into two tiers — films that stand alone, and shows that are now *required* for story continuity. Skipping shows used to be safe. It is not anymore.
These directly affect the next major films:
Time investment: A show is 6-10 hours. A film is 2.5 hours. If you skip the mandatory shows, you will feel lost in the next film. If you watch them, you invest serious time but understand the full context.
Quality variance: MCU films are (mostly) well-paced. MCU shows have 2-3 great episodes and 4-5 slower ones. You are watching filler to understand 30% of the plot. This is the real cost.
My recommendation: Watch the mandatory shows above, but at 1.25x speed during slow episodes. Skip the 'nice-to-have' shows entirely unless you have free time and enjoy the characters. Read a Reddit plot summary for the others.
Pro tip: Before watching any upcoming MCU film, google '[Film Title] + what shows do I need to watch.' Marvel has started being explicit about which shows matter. The next Avengers film will require at least 4 shows' worth of context — this is by design now, not accident.