Why Matlab remove old functions?

I am used to using simple function and I see that Matlab has removed this function. Why does Matlab remove the function, when they can overload functions very easily, rather than making us relearn new functions?

Answer 1

[Walter Roberson]

simple() is part of the Symbolic Mathematics Toolbox. The underlying representation of the Symbolic Toolbox has been changing, so Mathworks has to update all existing functions that use the symbolic engine. Holding on to old functions is not "free": they have to rewrite the internal parts and they have to test them.

simple() was removed some time before R2015a.

[Sushil]

Is that the reason most of the universities are moving to Python and R. Everytime Matlab new version comes, the old code breaks.

[Walter Roberson]

No, that is not the reason. Python has its own problems with backwards compatibility.