The structuring of a Television episode is different than a movie. The pacing is different as well. The only way to hold more information in 6 hour long episodes than 4 hours worth of a movie would be for every episode to end abruptly and begin right where the last one left off. Which just doesn't work well for TV. Every episode has to have an arc. A beginning, a climax and an end. While it's not uncommon to have a cliffhanger ending it is still done to a certain structure.
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The structuring of a Television episode is different than a movie. The pacing is different as well. The only way to hold more information in 6 hour long episodes than 4 hours worth of a movie would be for every episode to end abruptly and begin right where the last one left off. Which just doesn't work well for TV. Every episode has to have an arc. A beginning, a climax and an end. While it's not uncommon to have a cliffhanger ending it is still done to a certain structure.