I would agree in principal, with a caveat. The category of white/minor roads is not a fine enough discrimination to use for determining which w/m roads should be shown/hideable-showable. W/m roads can be
1. streets (in town) or
2. long streets that lead out of town to close Large Roads, or
3. local roads between towns.
If the same criteria were applied to all three, many towns would show as white blobs/tangles at farther zoom levels: not helpful.
It would be only #s 2 & 3 that I would want to remain on the map as I zoomed out. And those I would want to be able to see, as they often comprise short cuts between towns. Thank you.