If he means, from a mathematical point of view, Mathematica's ability to both symbolically and numerically solve advanced mathematical systems of equations, he's not technically wrong, even if his oversized ego oozes out of every word he utters.
If, however, he's talking about general computational systems vis a vis creating programs to run on today's microprocessors, he has obviously drunk too much of his own kool-aid.
> ability to both symbolically and numerically solve advanced mathematical systems of equations.
I mean, python, matlab, julia, octave, sage, and maple would all fit that definition I think. I do think Mathematica's CAS is the best in the business but not the only player for sure.
I'm sure Steven has something in mind that sets Wolfram Language apart, just not sure what that is.
If, however, he's talking about general computational systems vis a vis creating programs to run on today's microprocessors, he has obviously drunk too much of his own kool-aid.