They would again destroy leveling. I hate that I have to go to Sylvanas to get warchief's call to help Garrosh in his war in Ashenvale. They should revamp levelling to be HD Vanilla to make it okay with timelines.
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Then we would get less classes and races, so no. Also, these patches feel empty. Some patches, like Tides of Vengeance doesn't add any new zone. Others don't have any story outside of raids, for example Tomb of Sargeras. There are also patches that could be entire expansion with less rushed story, like Shadows of Argus.