What was a weakness of Thomas Edison?

Answer 1

Thomas Edison tended to hold on to a particular idea too long. As a result Edison held on to the idea of using direct current instead of alternating current much too long. Edison invented the diode. When the triode was invented Edison continued to try to accomplish with the diode what the triode accomplished easily.

His weakness was he did not see when an idea should be dropped.

Answer 2

One weakness of Thomas Edison was his tendency to be overly confident in his own ideas, which sometimes caused him to ignore the advice or contributions of others. Additionally, he could be ruthless in protecting his inventions, even resorting to legal battles to maintain control over them.