maybe it’s just my southern dialect talking, but it seems so incredibly unnatural to me when people write casual dialogue that has characters saying “It is” instead of “it’s.” Like, there’s a time and place for “it is” and it’s usually really stiff and formal. Contrast “it is my favorite story” with “it’s my favorite story.”
Again, maybe it’s just me, but the first one feels really awkward, like the character speaking is nervous and/or shy, while the second is more at ease. Which is only a problem, really, with characters who are supposedly talking to good friends they’re totally easy around. IDK. Just the majority of the time “it is” totally breaks the flow for me.