I agree with this wholeheartedly, and it's always made me lowkey self-conscious as a writer that I'm the only person I know who does this. ^^;
Like, I use a lot of ellipses and 'um' and 'oh' and 'like' all the time, because...I mean, that's how normal people tend to sound when they talk. For everyone in a book to "Say exactly what they mean in clear efficient words. Period." is really weird and immersion-breaking to me...it's a constant reminder that I am, in fact, Reading a Novel, instead of simply experiencing a story.
And I kinda think maybe a lot of writers would struggle less with dialogue if they allowed themselves to let characters sound like people, instead of always saying something "quotation-worthy". There's a time and a place for the zingers and the poetry; when you make characters talk like that all the time they just sound artificial.
Anyway, my own biggest writing flaw is (fittingly) making characters talk too much. ^^; I love dialogue; I love to just sit and watch characters converse in my head and write everything down. I don't even mind large group discussions, especially when the characters know each other fairly well and everything flows naturally.
Unfortunately, the longer I go on letting them talk, the further they tend to go off topic. ⚆u⚆; Every time I set up a long conversational scene, I look forward to it, but the work of constructing it is usually weeks of revising and re-revising to get rid of cute, fun lines that don't actually make sense, or deliver the wrong message about the character, or take the convo in the wrong direction, etc.
And it's very painful...to the point where sometimes I weaken and just leave in a line I really like even if it's not particularly "right" for the scene. It's fine...no one will know......
Whaaaa, is that true?? I feel like it would explain a lot about why I enjoy his TV writing so much. ^^
Tbh I find myself doing the same thing with my voice actors...more and more often I imagine their voices when I write instead of the "anime dub" voices I usually use, and tailor their lines accordingly~