I don't think a skillful "double your score" that's equally available to all players is the issue. It's when that feature is not offered to players for skillful play, but rather as a "pity" or random award.
There are other games that have similar "pity" features like Family Guy / Shrek's ball 3 Lard Multiball (or whatever it's called), and those pins are still used. But it's not QUITE as bad as a the unbalanced 2x your score.