I think from the synopsis given it's not going to be nothing, there's still a story that would be told (I'd say episodes like Applejack's "Day" Off is more of an episode that does nothing even for it's own story). It's just not meant to be some "this would only happen in the final season" kind of episode, and I think we're definitely going to have some of those this season regardless of it being the last season. Season 3 was also originally going to be the final season and even with only 13 episodes, while some would definitely cause developments to the show, they still had some episodes that "did nothing" at least in regards to the series like Too Many Pinkie Pies, Spike at Your Service, etc while some major character arcs like Rarity expanding her shops or the CMC getting their cutie marks were never actually developed. Instead, we've had developments like that occurring over the other seasons.
We've always had episodes that would be considered filler every season before and I think it'd be unrealistic to expect there to be no "filler" episodes this season. Rather, we should just hope they can at least make these kinds of episodes still good and entertaining.
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