MATLAB has over 2 dozen toolboxes, with insanely detailed documentation. We are actually very happy to have MATLAB and our engineers are trained to use it for decades. We gladly pay for it. It would be a massive undertaking to go GNU Octave even if it did everything MATLAB did. I think we are getting stuck in the weeds, the point is:
We are engineers. Software is a tool to get the job done.
There are many other packages that cannot compete with anything open source - ANSYS Mechanical for example.