Also worth bearing in mind that in the mid-60's, recording engineers had decades of experience working in mono, while stereo was a relatively new thing which often led to the temptation to go overboard with stereo effects so that people would actually notice the difference.
For just about everything recorded prior to around 1968, mono will give a "truer" representation of the music. After that, mono was being phased out anyway, so most things that were still released as "mono" were just stereo fold-downs.
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