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> Whether software is developed by a single entity or multiple developers has no relation to how complex the end user system will be.

The first part of this sentence is probably true, as far as I see, but the complexity of a system perceived by the user depends primarily on the "surface" of the system. That surface includes the UI, the documentation and important concepts you have to understand for effective usage of the system. And in that regard, ZFS wins hands down against LUKS + LVM + SnapRaid + your FS of choice. Some questions a user of that LVM stack has to answer, aren't even asked of a ZFS user. E.g. the question how to split the space between volumes or how to change the size of volumes.