Your entire life is open to Google if you use Gmail. Google has demonstrated a willingness to run algorithms to analyze that life. Google can, at any time, for any reason, ban you from its platform.

If something in your life runs afoul of Google, your identity gets shut down. This wouldn't be a big deal if you weren't using Gmail as the hub for tons of your identity and logons--but many people use it for exactly that.

TLDR; non-meta risk is high and unpredictable if you use Gmail as a life hub, much lower otherwise.