Typically, poor decisions or other mistakes are a result of flawed or incomplete thinking, not the absence of thinking. Do you agree?

I most cordially disagree.  Many poor decisions are characterised by the absence of thinking.  People often "think" with their emotions, assumptions or prejudices.

Agreed............. Immature or premature thinking can result in poor decision making.

Agree <<<<<<<<<<<<<<<<<<<<<<<<<

Yes I agree. However absence of thinking is also a root cause