I think the simple answer is tone. Just as a silly moment can undercut drama and the serious tone, a serious page in an otherwise light-hearted comic is jarring.
Imagine if Garfield and Jon had a moment where Jon confides in Garfield that he has cancer and he is worried it may be fatal; without some sort of punch line to lighten the moment it would feel sad, dark, and foreboding which goes against the tone set by the rest of the comic.
Fucking gross. Maybe it’s the 250+ audiobooks I have influencing me, but the very best ones I’ve listened to transcend just turning words into sound. Sound effects, music, tone, emotion, accents, sarcasm, and god damn BLOOPERS all improve the experience beyond just hearing what is written down.
I’m against it, fuck that literal noise.