But to my mind one of the real strengths of Spelljammer is it's refusal to take itself too seriously. It's a setting that recognizes the inherent goofiness of D&D, embraces it, and doubles down on it.
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After playing through 5 editions (and then some) I'm letting that sort of be my guide - if there is humor in the PH/DMG.
1st ed had the cartoon "+5 backscrater" "Last mostser we talked to ate half the party" "papers and paychecks".
2nd - I didn't see much of it, but aside from Spelljammer it seems very serious and intense.
3rd - we had the failure for Mailee on use magic device, Karsk helping someone elses climbing by having his face stepped on.
4th - saw no humor in books at all.
5th - It may be bad art, but I love the halfling bard just rockin' out so hard his eyes are closed, and the general conversational tone of the book makes it inviting.
Even basic D&D had a cursed magic item called "Finger nail" that was a construction nail that would float and point at you if you were invisible.
Spelljammer was my favorite D&D setting, Dark Sun and Planescape my least favorite.
It seems the less seriously D&D takes itself the more I like it.