Saki isn't a trap.
Hato hangs with girls because there aren't a lot of guys that like BL.
And while him being a BL fan and apparently not being gay is a bit strange, the author has never shown him masturbating to yaoi.
I miss the old characters too, but I guess the author, after showing male otaku in the 1st part, wants to show the female otaku. Showing the guys again would ruin that.
What I think this manga needs right now is a yuri fangirl.