Lightroom: Ability to merge Keywords in LR future?

So, eight years later I'm searching yet again for a better way to merge keywords and came across my post from 2010. https://forums.adobe.com/message/10423855#10423855 Still no good way to merge them that I can find, just one at a time selecting, adding keywords to the images of the same key and combining them in a terribly slow and laborious way only to have them all duplicated again the next time I import images from a keywording service. Wow, Aperture was capable of this in 2006 but Lightroom still can't do it in 2018. I suppose it's safe to assume the LR will never be able to do this and keywording will remain a huge spaghetti bowl.