How Engineering Works
Harmless tests with a vague purpose are often deemed pointless, don't do it...
...right up until that one occasion where a significant problem is found because someone was doing it anyway.
Besides, I don't think anyone with an ounce of mechanical sympathy would ever tire of setting in motion such a great hunk of metal that's so nicely made and turns so smoothly.
I can remember seeing a Cathy pilot, a few decades ago in Taipei, doing just this prior to our onwards leg to HK. Not that we'd noticed but apparently something feathered had gone into No.2 (747-200 I recall) on departure from Fukuoka (or approach to Taipei), and we weren't going anywhere until he was satisfied that all was basically well.