Earlier quoted context omitted.
It makes it easy to type, but does it make it easy to read/maintain? As they say, it's already way too easier to write code than to read it. A programmer should make every effort to make code more readable. An editor should make it relatively easy to enter special symbols (especially if you can specify a limited set); it is totally solvable problem. An editor can only help you so far with reading code...
I believe it is most definitely easier to read/maintain -- restricted to that small domain-specific function. Some greek letters have very specific meanings, replacing them with long-ass names straight up worsens readability. Writing out density, velocityX, etc will quickly fade the core logic of that function.
The use of greek letters in academic writing has a single purpose: Compact notation. It has nothing to do with abstract readability.