For one, the series reveres one character, very excessively. And two, the PLOT weakens every episode. Three, and is tied to the plot, it doesn't seem any thought is put into its trajectory. Four, it's conspicuously clear that the series is mainly for an eternally lasting cash-grab, out of the pockets of the die-hard fans that would rather support a bundle of insufficience than reject it for better prospects. And if you just look at the recent most popular/watched anime right now, Boruto doesn't even cut it to be in the top 10, so you're basically looking at a franchise that's wading into rock-bottomness. There's basically no reason to keep watching a series with a decreasingly puny fan-base. The fact that everyone's disembarking from the ship tells you it's not on the same tier the prior series was and can never measure to it since people actually gave it a chance, more than should for many, but that's just my side of the story