There's an old saying, "you can put lipstick on a
pig, but it's
still a
pig." The problem with rehabilitating coins that have been harshly treated is that even with all the dressing up that you can do, the damage that has already been done is irreparable, no matter if it's covered up. With the original
patina gone,
part of the coin has been lost. When chemicals or
electrolysis has made the surface of the coin rough, no amount of
toning will bring back that smooth surface. When a scratch has been gouged into the coin while cleaning, it can't just be filled in with putty and painted over. Can you make a bad coin look better? Sure. But, it's just not the same. New collectors need to be educated on how not to ruin irreplaceable coins, rather than how to strip, scar and destroy a coin then try to make it look better.
I guess it's a matter of opinion, but most collector's don't want a reconstituted coin.