Why this 1959 (!) Bach Recording has a strong Emotional Impact

Thomaskantor Kurt Thomas recorded in 1959 – 60 years ago- Bach’s Christmas Oratorio BWV 248. Many of your expressed an explicit emotional reaction while listening to that recording, as happened to me.
Time to stand still for a moment. Why is that? What are the mechanisms behind it? And, let’s look in the mirror : are we focused always on the right elements in the so called historical informed performance practice?