Don't learn a language but learn tooling? As in learn the most likely thing to be completely tailored to a company's specific processes, undoubtedly using somet

Don't learn a language but learn tooling? As in learn the most likely thing to be completely tailored to a company's specific processes, undoubtedly using something you've never used before, and impossible to actually practice on at home with learning or side projects? That makes no sense, especially for a software developer.