If you've actually watched the series, which had a definitive ending written before production, then you know the major theme of the show is mental health.

You'd also know that the main character's endlessly chipper attitude is revealed to be a coping mechanism passed on by his mom after his dad committed suicide.

Some people out here be reading into shit they haven't seen like they're my 8th grade English teacher pretending they understand the alcoholic mind of a famous author that's been dead for 50 years.