Yes, that would be amazing, full classes of approaches to problem solving would be unlocked at once and we wouldn't have to invent new languages, DSLs, transpilers, etc, but just leverage zig.
Fred should learn how to squeeze in his refactorings into other, related tickets. And to learn how to argue about why an user story is more points worth, without explicitly saying the R word.
Sounds like the effects of temporal coupling, or "settism and gettism", or other principles, which are violated. People are blinded nowaways too much by SOLID, and forget about the remaining 20 principles.
Normally, bright developers acquire a new language* within a few weeks, if they already know the paradigm from another language. Hack is OOP, and so are many others, so I would expect a bright developer to learn hack in 2-3 weeks, not months.
Heck, I just read the docs of hack for 2 hours, and I already got a good sense of what the language can do. I worked with PHP internals, and a bunch of other languages in my career.
* as language we define the language, its syntax and semantics, not any other library or the ecosystem. And yes, the standard library is still just a library. Knowing a list of functions and parameters does not mean knowing a language.
When I was a junior, I could write my queries in SQL in 30 minutes for the report which was asked from me, but I needed two more days to figure out how to do it with the ORM.
For juniors, it's best to have a less abstractions.