The sad thing is this bothers me less than the new Scooby Do episode where there really is magic and monsters. One of the endearing things about the classic Scooby was that it was always some guy in a mask.
Are you talking about Mystery Inc? There's still no magic/monsters in it - the large overriding arc (two seasons!) has ancient aliens behind it. No "magic" & they quite clearly call it out that it's not magic. ancient alien technology hidden on earth, sure
And the monsters of the week are still always people in rubber masks - it's a strong reoccuring theme throughout it still that the monsters aren't real.