When I was in a murder trial, I was shocked that the defendant didn’t testify. It was for 1st degree murder and all he had to do was put doubt in our minds about “malice a forethought” since there was no witness to the shooting. He could have said “We struggled over the gun”.
On the other hand I was on a jury regarding drug dealing in which if the witness had not taken the stand there would have been reasonable doubt in my mind. I think she as ill-served by her attys.