Stupid reasons really.
There's no reason at all to believe the movie will mirror the comics, the mcu only loosely takes from the source and I don't see why that change now.
Movie Thanos is a completely different character when compared to comic Thanos and everyone loved it. The guardians shared almost nothing in common with their counterparts and it was a huge hit.
Why can't the same apply here?
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https://imgur.com/NSA8rGe