I would say I'm relatively pragmatic. My main use case would involve DifferentialEquations.jl modelling either certain quantum processes or model equations of biological neurons. I have a rough idea how that would work and what kind of abstractions I would like to implement. I mainly have not been able to get a good developer experience with it, so far. Things tend to either work or fail rather drastically (spectacular long back traces). But it clearly is very useful, so I will probably bite the bullet and try to use it again.