I was listening to a playlist I made on Spotify a long time ago. A recording of Brahm's op. 117 came up (I think I put a lot of them in there). I guessed the performer as Rubinstein, seeing that it was so intimate and Romantic. But, lo and behold, it was Glenn Gould who was playing...
Why do you think Glenn Gould's Brahms is so good and "non-eccentric?"

compared to his Mozart, Chopin, Beethoven... even his Bach (some would argue that his Bach is also played eccentrically, despite being loved by generations of people).
that recording of the op. 117 was "soulful," played stylistically in a "correct way," and was the antithesis of the brittle, detached sound he employed in almost all of his other recordings...