A real senior has 20 years and stays away from buzzword tech. I have nothing against tdd but its a techique that is not that popular. Why would everyone have

A real senior has 20 years and stays away from buzzword tech. I have nothing against tdd but its a techique that is not that popular. Why would everyone have experience rabbitmq. Some might know aws or azure or google cloud or vercel or oracle cloud or 50 other vendor solutions. Why need to know them all or any? These things can be learned and past learnings transferred.