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To give some context, IIRC the main reason why impl Trait was added in argument position was because it was needed in return position, so they added it for symmetry. This also has the benefit of being slightly easier to read when there are many type parameters. You can see some of this in the tracking issue for impl Trait.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.