While I am not this extreme, I do think that there is value to having a set of tools that you really know and have read the manual for (for me it's git, common

While I am not this extreme, I do think that there is value to having a set of tools that you really know and have read the manual for (for me it's git, common unix commands, Postgres and your "main" programming language). If anything, it gives you an appreciation for programming languages that are not only simple to write but also simple to reason about.