Earlier quoted context omitted.
Something you didn't mention, which I suspect is a major factor in why promoting FOSS alternatives proves surprisingly difficult in education. I remember when I was in university students were acutely aware that tools like PhotoShop, Microsoft* and MATLAB were used in businesses. I doubt this has changed. Even if superior Free options had been available, many of them would still have opted for the "safe" proprietary…
I can't speak to Matlab/Octave but as for Photoshop, FOSS folks always say use GIMP. But the interface is just so terrible compared to PS and I think they underestimate how important that is. Maybe it's configurable but for example, simple things like alt-tabbing between GIMP and other programs was painful because it opened parts of its interface as separate windows, so you'd alt-tab to your browser, then back to GIM…
The GIMP-over-Photoshop argument should be because it does something Photoshop doesn't (very possible with its ecosystem of plugins/filters -- for example a "smart remove" plugin was around for quite some time before Adobe made their own and spent who knows how much in marketing/demos for it) or because the artist wants to save money.
Agree that people are goal oriented. OSS that's free-as-in-beer can help drive adoption on account of being free, but ultimately the best OSS succeeds because it's better than its competition in important ways. Pure clones are risky, I'm glad Gimp doesn't try too much to be a clone.