I agree 100%. I'm not particularly interested in the other girls as romance candidates. Imo it has become boring because it doesn't have the lead commit to any particular relationship. Plus, the other girls aren't very interesting. They're generic and it's hard to see what they see in the main character.
It would have been better if they focused on the sister. Maybe one rival to keep things interesting and to challenge the brother's indecisiveness.
it does feel like the series lost direction the moment the talent scout showed up.
I can take or leave wincest, but focusing on just him and Akira and their dynamic would have made for a more compelling story, I think.
You have the other acting sibling duo to set up a point of contrast, with the
potential for a triangle (or even rectangle, if you wanna get real Drama about it) to spice up the narrative, but now with the gaggle of other girl characters who inexplicably fall for the MC because "he's just a nice guy, yo" has really screwed with what I thought would be the primary point of the story.
There was a concrete angle with the "high school boy gets a boyish younger step-sister who falls for him and he has to navigate school and life and his feelings and society", but now as someone else said it's just a dull harem with a devolving Male Protagonist whose primary trait is "I'm baseline nice and polite" with nothing interesting about him.
That, coupled with the super pushy talent agent who's hellbent on signing his sister and pushing her into acting and has weird shady ties to Akira's father, and it's just way too much happening all at once.
It wants to be super dramatic and also harem shenanigans and also "oooh wincest" and yet "nah no taboo here lol" and it's like ....pick a lane, Mangaka-san.