I say that it's sometimes hard to discern between "refinement", "paring down", and "decline".
I also say that even more important/relevant than "technial" vs. "idea" is how inspired/engaged/etc/youknowwhatImean he was at any given moment. That seems to me the wildest of the wild cards right there, and with all the number of variables in play, hey.
I also say that for the longest, I had a really hard time reaching for a Columbia Monk session when I had all the other stuff on the shelf right beside it. That's opened up some over the years, but only some, if a lot of some.
In closing, I say that the cat's long dead, and will be for the foreseeable future. So hear what you want/need to hear, be inspired by it how you want/need to be inspired, and proceed accordingly.