Wasn't it established a while back that their speech bubbles are rounded, almost like human speech bubbles? Implying that their speech is more organic sounding?
It was also established a long time ago that Jeph struggles to remember details like this.
Pretty sure Yay can switch between vocal styles at will, to “create the right impression” as it were. They have just been hanging around with people that already know they’re robots.
The mental gymnastics I make myself perform is to consider that Yay is multibodied, some of those bodies are older, which may or may not have joint seams, and older vocalization technology. This is to give the comic the benefit of the doubt so I don't get lost in the minutia of inconsistencies and just enjoy the story. Like the fast jump from Auriela's house to Roko's is as simple as popping a Yay body out of the charging bay in Roko/Melon/Elliott's building and go ask Roko a really important (to Yay) question, leading to the inevitable conversation about the difference between knowledge and wisdom. (I consider emotional maturity as just another branch of wisdom)
Hey speaking of getting lost in minutia! Do robots feel comfort? Roko is usually seen laying on the couch to charge (save for one night of breading). Bubbles, Momo, Millie, May, etc. all seem to just sit in a corner to charge, unmoving and in some sort of robo-dream state. Wondering why Roko always charges on the couch, and why she would put her hands on her tum. Also wondering why Roko's arm flopped off, assuming she put that hand on her tum like the other one, they don't twitch like humans do when sleeping, they also don't seem to get a sore butt from lack of blood circulation, a charging pod seems just as acceptable as the floor, or a big comfy bed with a big comfy Faye. Mostly just wondering about the notion of Robo-comfort.