Involving Hela would have cheapened Thanos and his motivations. They needed a strong villain and a strong character. Bringing up a previously never mentioned association would have made it seem like a cheap afterthought.
Thanos’ motivations needed to be his own. You can’t have the main villain who has been pumped up for 10 years turn out to just be a lackey, which is how it would have been perceived if they’d have made it about Hela.
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