Identifying +ve climb is not a big issue. The real problem is understanding priorities. Gear is not something that is to be got rid of as quickly as possible. I can't think of any incident where raising gear quickly or out of turn saved a disaster. It's other way round. In EK case if gear wasn't retracted aircraft wouldn't have been written off. On GA it's power, pitch, flaps then gear. On a low GA you hit TOGA, small change of pitch flap gear are left as they are till you are climbing away. No attempt is made to avoid ground contact because gear is the only part that can take impact load. Tail strike is more damaging.