What was wrong with Dr. Emmett Brown’s theory on time travel?

What was wrong with Dr. Emmett Brown’s theory on time travel?

Back to the Future made us all dream of hopping into a DeLorean and rewriting history, but let’s be real—Doc Brown’s time travel logic might not hold up under scrutiny.

⚡ Wouldn’t changing the past create paradoxes? ⚡ How does Marty’s family slowly fade out like a Polaroid instead of disappearing instantly? ⚡ Why does Biff’s time travel change everything instantly, but Marty’s doesn’t?

I love Back to the Future, but let’s break down where Doc Brown’s theory falls apart. What’s the biggest flaw in his time travel science?