Most of the folks you mentioned have kind of served their purpose and there is no reason for us to expect them to be around (we have to just assume they are there and all is fine). But I agree about the August thing. Emma cared of him (whether romantically or otherwise, she realized he was right and that she kind of screwed him by not believing him) and I CANNOT BELIEVE she hasn’t been like “ok, I’m home, I hugged my kid, got the Sheriff’s badge back, walked in on my parents being married, made some tacos, wrongfully accused someone… now I need to go find the guy who helped me!” and at least checked on him?!
Unless she totally forgot the state she left him in when she was trying to save Henry and ended up breaking the curse (which, rightfully so, a whole metric crap-tonne of stuff happened that day, and then she spent some time in another world).
I miss August!