There is no issue hiring juniors, they have a lot to learn and they should be coached through it for sure. That mid level, help coach juniors, is also not an issue. But I would rather hire a junior analyst or a junior engineer than a junior data-scientist. The breadth of what they need to learn before actually delivering value is quite vast.

I can hire an analyst or engineer and quickly they will be able to learn, get good at something and deliver value. After 2 years they can easily grow into a data-scientist with the good base they have had from their previous positions.

Some organization essentially rebrand analysts positions to "junior datascientist", but I believe this make it a mismatch of expectation for graduates getting out of school.