you cannot compute TeX... there are two versions of MathML: presentation MathML (which is like TeX) which shows only the look. And there is content MathML which describes semantic. So you are comparing only one side of the medal with TeX ;) See here https://en.wikipedia.org/wiki/MathML#Content_MathML

But I agree TeX is easier to write and read if you only care about the look and feel.