Think of MathML like SVG. It is a target language which browsers understand. With SVG you can write it in hand, but most likely you are gonna use a special edit

Think of MathML like SVG. It is a target language which browsers understand. With SVG you can write it in hand, but most likely you are gonna use a special editor (Inkscape) or a library (d3). With MathML you can write your equations e.g. in libreOffice or pick a library like MathJax or TeXZilla. In fact I wrote a library my self which compiles a AsciiMath derived language to MathML, it was my first time writing a compiler, and it was an absolute joy targeting MathML. The mapping between DOM nodes and XML nodes is a perfect fit for the web as it allows my to implement DOM as a direct target (`mathup(expression).toString()` vs. `mathup(expression).toDOM()` and even `mathup(expression).updateDOM(parentNode)`. The documentation for MathML on MDN if fine actually, good enough for me to write a compiler. The structure of the language is much easier to compile to than LaTeX by nature of actually having a standard (as opposed to an implementation which functions as a standard). MathML is a unique fit for what it was intended to do, which is a targeting language which browsers understand.