True, didn't really think of that. The main reason why I bring up Good as Gold as a problem is that in the past before we had mortal spin, ghost types were always able to spin block. Defog was seen as so revolutionary because despite removing your own hazards, it couldn't be blocked. Though yes, the Ghost typing does exacerabate the problem (I don't think mortal spin is that useful as it's on a pokemon who's main thing is getting up hazards early in the game, ergo it doesn't live that long. It is still a nice option to have that you need to consider.), it means that the most 'reliable' (although it hasn't always been, see Gen 6 where spikes stacking teams were still common due to the lati twins/zapdos being the only consistent defoggers) hazard removing option is null and void.Mind that hazard removal is of no fault to Good as Gold, that only stops Defog and Defog alone. Giving it to a Ghost type is the problem. Making it a Steel type while also making a poison type Rapid Spin is a slap in the face.
Maybe they make a Grass or Water type rapid spin? Something.