I read it as "compared to others, in the current context".

If you take some percent longer to finish a some code, because you want that code to maintain some level of "purity", you'll finish slower than others. If his is a creative context, you'll spend more time on boilerplate than interesting stuffs. If this is a profit driven context, you'll make less money, less money for staff. Etc.

> If you’re not willing to risk being “left behind”...

I think this is orthogonal. Some tools increase productivity. Using a tool doesn't blind a component person...they just have an another tool under their belt to use if they personally find it valuable.