[shakow]

IME, for having used Julia quite extensively in Academia:

- the development experience is hampered by the slow start time;

- the ecosystem is quite brittle;

- the promised performances are quite hard to actually reach, profiling only gets you so far;

- the ecosystem is pretty young, and it shows (lack of docs, small community, ...)

> what's stopping people from switching???

All of the mentioned above, inertia, perfect is the enemy of good enough, the alternatives are far away from python ecosystem & community, performances are not often a show blocker.