In my experience, this mostly happens with people who only know one technology. Many juniors are like this. On the other hand, when this happens with a senior, they fight extra hard.

I suppose it also depends on company culture. What happens if a technology you have never seen before is selected for your project? Are you given some time to learn and is it expected that your initial contributions will be smaller, or are you supposed to be just as fast as people who used it for last ten years and get negative reviews otherwise?