Junior developers in javascript codebases of 7-10 years old will not have the experience necessary in some cases. I am coaching them as a manager trying to introduce a concept, not a professor.

I may be doing a disservice to their long term development at the cost of short term gains. However, I don't think this is true. There are a lot of developers who will never work in a C, C++, C#, or Java codebase. And I try to adhere to Krashen's "comprehensible input" theory as it has a lot of application to learning the language of software development as well.

(See https://www.languagehumanities.org/what-is-the-input-hypothe... )

Why do you have junior developers maintaining codebases older than themselves? ))