So according to you anyone writing in a sophisticated way makes those characters sound old? Isn't it just the case that JMS writes that way?
And in any case...Peter Parker's a science student who came to college on scholarship and is quite brilliant. Mary Jane Watson is an artistic woman who studied psychology and loves theater and film. So of course both of them would sound sophisticated.
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Wow, indeed. You totally misread the scene and moment.
In that scene, Spider-Man goes out to vent a building that is revealed in the following panel to be a "condemned" abandoned building scheduled for a controlled demolition. In the scene right after on the next day, a construction foreman calls out the boys for a hard day only for the building to fall down thanks to Spidey...and he says jubilantly, "lunch". Spider-Man vented his frustrations and also provided help to construction workers at the same time.
Yes we all know how his characterization and portrayal is at all inconsistent with what came before.
Well there aren't actually spider-demons in that story. Just a giant spider.
Being a chosen of the Spider-Totem doesn't mean that Peter Parker has some destiny or anything, it merely emphasizes that Peter is the character who will always be persecuted by powerful people and he has the spider will escape, defy, and beguile them. Nothing fundamental was subtracted from Spider-Man by JMS, he just added to stuff that's already there.