Just read a review of Wind and Truth and I liked the quote "Is Honor a childish idea"

[Sythrin]

Central to the theme of WindandTruth, where it is questioned how good actually Honor was and the theme of "Is honor a childish idea", is just such a great way of putting it, in the way that honor is at the end portrayed as a manifested child. I love it!

[KaladinsSenseOfHumourSpren He/Him]

Yeah...

Honour, or the Almighty, had been portrayed as some perfect being before this. Shows how flawed gods can be.

[Dofurion]

I honestly disagree...

I think I've posted this before, but for me, Honor's problem is that he was the god of oaths, but he never bothered to have a defined ideological framework. If you look at the narrative in WaT, he only makes two oaths, and both are circumstantial (without foreseeing the consequences).
I think things would have turned out very differently if, for example, Tanavast had just begun to carry the Shard and professed the ideals of Windrunner or Bondsmith. Or even further, and those of Elsecaller swore to Divinity.

[Ripheus23]

Maybe that's what I missed... I had this sense like, "Honor and Odium are both Big Bads, here" (as of W&T) but I think in-text or in a WoB, Tanavast's decency is attested to. So, I'd have to be thinking, "Sanderson is showing that a good person can be a Big Bad, somehow, nevertheless."

But "Honor is childish" explains it without all that, maybe? In fantasy without Big Bads, you often/usually end up with having to face off against a natural/industrial disaster situation of some sort. Like, setting aside the issue of Metatron, in His Dark Materials the key endgame is an environmental problem that isn't the responsibility of any specific Big Bad as such, a problem triggered by multiversal technology. The Vessels are like that, they're facing off against their own Shards in different ways, and before against Adonalsium to boot. So, the "Big Bad" kind of effects Honor and Tanavast have had on Roshar were more like "natural (magical) disasters," in this case the catastrophe of the god of oaths being inhabited by such a childish conception of the universe.