In article , Mxsmanic
wrote:

typically to darken the sky. other filters can affect foliage, skin,
and other parts of the subject.

For special purposes, one can filter.

that's the whole point. for some situations, filters are very useful.
nobody is advocating using the filters all the time.

But unfiltered B&Q usually looks just
fine if the spectral response of the sensor is not too different from that of
human vision. The main difference between silicon and a retina is that silicon
has much more extensive IR sensitivity.

different issue.