Debanding is an inherently destructive process. It is not needed for
most high-quality sources and only produces an adverse smoothing effect
when applied to fine-detailed content, removing detail. It should only
be applied when necessary, either manually with the `b` keybind or with
an automatic profile.
Additionally, it is quite computationally heavy with no real benefit for
high-quality content.
By default, and especially in the high-quality profile, mpv should
preserve source detail and quality as much as possible. Additional
processing should be opt-in.