The author writes "Once I became a manager, I finally saw why they were needed, but felt guilty about using them."
You SHOULD feel guilty. Truth matters. Trust matters.
If you're having problems with estimation and planning, then success looks like working on these areas-- not faking them.
Good tactics to try are work breakdown structures, planning poker, transparency for timelines, good project management tooling, critical chain scheduling, and above all trusting your teammates.