Yakuza 0 – Crime Drama & Crazy Side Content

Yakuza 0 is a crime drama set in 1980s Japan with tons of side content—what makes the game’s mix of serious story (Kiryu and Majima’s rise in the yakuza) and silly side quests (managing a cabaret club, playing arcade games, or fighting in street brawls) so addictive, and which side activity was most surprising or fun, especially when it provided a break from the intense main story?