Why Nervous Fans?

Cavs fan here, out of curiosity, how come you some of guys are nervous about G7? You guys are the best or one of the best teams in NBA. With the one of the top 5 players in the league with a great supporting cast at home in the Oracle. As an outsider I feel like it's gonna be a depressed Thunder team that collapses after blowing their chance to put you guys away. Please don't take anything negatively, just wanted a discussion :)