The rescaling method itself isn't as "hereticly bad" as most pixelartists put it, but only if used as a tool, since it litterally is what the "resize" function is, a tool. This pixelart for exemple has started as a traditional drawing resized to my usual pixelart canvas size, then oignon skinning have been used as guide for the pixelart outlines. That's just a minor part of the process, but still part of it or this one I won't deny.Basically, I don't mind it when used as a guide by those who (for whatever reason) can't directly envision color-shapes exactly, or try to gain time when asked to create a pixel version of a concept-art that was given to them. The "posterized" method, however, is a no-no as it mess up the palette. Better pick base colors from the non-resized picture and rework the palette than using this function.Like you mentioned, it is important to carefuly create a palette and work from there, as just downscaling a picture don't make it pixelart.