For simulation it's not even close. Open source can't do user interfaces. Not a problem for programming languages, but for simulation at least, there's a slew o

For simulation it's not even close. Open source can't do user interfaces. Not a problem for programming languages, but for simulation at least, there's a slew of powerful but unusable open source software made by professors and then there's expensive proprietary ones with nice front ends that save enormous amount of time for the users.