It would be very nice to have support for complex geometries. In my project, regular FEM is used to perform some calculations for a 3d aircraft model. Getting the complex geometry of the aircraft into NeuralPDE.jl is probably the main obstacle for using NeuralPDE.jl for some required optimizations and other tasks as well, e.g., having a function for the impact of the pressure of the hydrogen filled tanks, impact of the aerodynamic forces and so on. For now, for each modification, a FEM calculation must be performed.
So I am looking forward to the feature of integrating complex geometries. By the way, the open-source community which performs FEM calculations, often makes heavy use of GMSH as their meshing tool. Ideally, one could use gmsh for meshing and insert it directly to NeuralPDE. Gridap and Fenics allow reading the gmsh mesh.