I just realized how easily Thanos destroys Vibranium.

Just wanted to add, hopefully without breaking headcanon, that Strange definitely had some hand in shaping third stage Thanos.

I think it's totally possible that Strange saw multiple futures where they stopped Thanos, possibly even on Titan, but at the cost of one or more lives, or even a worse outcome than the snap (I don't have enough lore knowledge to guess what a blindraging Quill could have done with the gauntlet as a quick example). Strange found a shard of time where no-one dies and things could be returned to normal (or perhaps something greater worth risking?), then set events in motion in order to thread the needle.

Anyway, I'm not bringing this up to diminish your analysis at all. Thanos had already shown restraint multiple times before that stage as you said. I think it all just adds to the believability that he didn't just vapourize everyone instantly to get the last stone (and I love thinking about what futures Dr Strange saw...)

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