Also, I think it takes a long time before you can judge if an engineer is really good - Many months, sometimes it takes years before you see any payoffs! Also

Also, I think it takes a long time before you can judge if an engineer is really good - Many months, sometimes it takes years before you see any payoffs! Also some engineers might not be great, but they are good at picking the right tools for the right job and as a result the whole company ends up doing well. I don't believe in 10x developers because sometimes small engineering decisions can have a disproportionally big impact on company success.