If there's no arcs or at least emotional throughlines, once that episode is done, you have no hook to be excited about the next.
It's why shows like Parks & Rec, Buffy, etc that are the most rewatchable of them all. The story is cut into neat digestible bits, but you have things like Leslie's city council campaign that give characters long term goals to work toward that build up to a climax and emotional payoff.
Without that emotional payoff, if I know every episode is just going to be zero sum without any actual consequences, I'm much less excited to keep going. There's no tension if I know all the consequences will be erased at the end of the episode.
That doesn't make sense. If you're rewatching a show, you already know how everything goes. There would be no more "tension" or "payoff" in a multi-episode arc than if everything was wrapped up in one episode. It's like saying "Amok Time" isn't rewatchable because T'Pau was never mentioned again and we never found out if she was offended after finding out that Kirk was alive, she was deceived and sacred Vulcan rituals were dishonored.