I think Julia looks very sexy and students jump on that, often without considering whether they will be their actual work done or spend time porting libs or debugging things I can’t help them with.
I was also and continue to be worried about the tooling, the lack of good tutorials and especially the Type driven system. I like it so far but Object Oriented is a lot more familiar to many people. The library situation for me specifically has tipped to be a net positive. I also could transition my very small team off Python completely.
So it was not an ad hoc decision, I tried it several times over the last year's and decided it's not there. In my specific situation, with a rewrite of a core library coming up and the library situation being there that changed early this year.