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Regarding the figures in the OP, lack of versatility and redundancy.
First, it's got one of the biggest issues of early 21st century Lego, namely too many specialized, large, bulky parts that aren't particularly useful outside of very niche roles. Second, Bionicle does and did the same general thing much more efficiently, and combined with writing people actually cared about and still care for it's easy to see why it got a reboot, even if short-lived. The fact that the figures weren't that good (as far as I remember) doesn't really help their case compared to Bionicle, which has the capacity to both feel a lot more flexible in posing terms and which, thanks to its integration with Technic, is much better for when you want to build whatever the fuck you want.
Knight's Kingdom's big knights could have potential if TLG could've figured some way to make them less like early 21st century Lego, but as it was the fact that it went as far as it did even then is mildly surprising. What I will say Knights' Kingdom did well was exist as a line of ordinary minfigures and Lego System-based sets, something Bionicle generally seemed to struggle with to my memory, but most of my personal experience with that was with the Hordika-era sets where TLG was only just figuring out how to turn Bionicle as a property into System sets, and even having never had them the Ignika and Mahri System sets looked more solid.
