I think Kate Bush is mostly amazing but... it's song-dependent.... for example -
If that one had been her first single then I think she'd have been rightly dismissed as a very annoying, cheesy, expressive dance student with terrible cheesy lyrics (and I LOVE old Hammer films). Without an AWESOME song to back it up, it's just irritating and crap, so my view is that 'novelty' element doesn't add...it only serves to get attention (not that she did it for that reason necessarily) whether the attention be for good or bad.
What I'm saying is... I 'put up with' her weird dancing and sometimes it was really effective, but when she sang the right songs, she was just as, if not more, impressive and addictive when just sat at the piano. The 'novelty' elements were less important, and at times a risk to credibility (and enjoy-ability).
I do like 'theatrical' in music (probably why I USED to enjoy Metal performances in my teens)... I liked the morbid looking string section in 'that weird bloke's' song, and his space suit in the other song, and smiley-to-the-point-of-menacing demeanor generally (I think his style is visually more impressive than Kate's in fact) .... but.... doing that thing with his tongue could never be good, could never be 'cool', in my book, and since that's an audible rather than purely visual 'novelty' (although seeing it makes it worse) it spoiled the song...for ME.... so I would have pointed that out.
But... we're all different.
Opinions expressed are my own