Or maybe it’s because anime is such a visual medium that creators are more comfortable expressing themselves through visual art than spoken words.
While audio commentary tracks are pretty much a given on home video releases for Hollywood movies, they’re few and far between for anime releases in Japan.
As such, Anno’s being so comfortable in openly ribbing Miyazaki is likely more a sign of genuine affection and respect than earnest criticism.
However, it’s important to note that despite Anno’s acerbic grumbling, he and Miyazaki have a well-known, long-standing friendship.