correction, I think music videos should eventually have their own release groups, if/when the Video secondary type gets added… I wouldn’t split many (if any) release groups until that happens, but when adding new video releases, I create a new disambiguated release group, and (going forward) with a link to the audio single in the annotation 
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Yes, but some were ‘released’ as singles as in made available and shown on tv etc in support of the single. Likewise, others were not ‘released’ as singles. I agree with @UltimateRiff that these are probably better as their own release group which would allow all the different medium (media) to be recorded. There’s also an argument that the video itself is a work. Difficult. Keeping the relationship with the original music is important.