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To answer your questions more precisely/individually:
if we are tying more healing to GCDs, would this then be something that is more expected across all content, so that every GCD is not a damage GCD?
Yes. Since that also be to the benefit of healing kits and healer gameplay in general.
Why just change the one thing when there is so much more that needs to be considered.
I've made no such suggestion.
However, it still doesn't change the fact that the only time you would use it is when you are forced into it.
Wrong, unless by "forced" you mean "whenever, under perfectly performed mathematical calculations, it would be an increase to party DPS."