One of my worst job experiences was when I depended on a colleague who wouldn't deliver. Any feedback or conversations with that colleague mostly resulted in tantrums and empty promises.
The lack of delivery severely harmed the services I provided to the company and to external users, ruined team morale, and was a huge source of stress.
My boss always turned the problem back on me, despite him also being my colleague's boss.
I tried everything I could for 18 months and had extensive documentation of all my attempts, sometimes working in parallel with my boss or using his recommendations.
Still, the problems persisted and every time I brought it up with my boss it was as if he was oblivious to the ongoing saga. I want to HR and over his head about it and he always fed me shit about "empowerment" and "growth."
Yeah, I was empowered to interview with other company's and grew into other new roles.