There's a very interesting video about the "1.5 language problem" in Julia [0]. The point being that when you write high-performance Julia it ends up looking nothing like "standard" Julia.

It seems like it's just extremely difficult to give fine-grained control over the metal while having an easy, ergonomic language that lets you just get on with your tasks.

[0] https://www.youtube.com/watch?v=RUJFd-rEa0k