“Almost” and “easily” are subjective and open to interpretation. My point is, that this is not a rigorous standard.

Languages are generally not very amenable to these things.

If you want to construct the entire field of linguistics mathematically that would certainly be interesting to watch. Since a function that is described by a simple equation is mathematically equivalent to a function that is described by a table assigning the appropriate values to each element of the function domain, you could try to come up with a definition for what constitutes the "optimal" way to describe a function. Do the same for any kind of relation.

Until you've done so linguists will sadly be stuck applying nothing more than common sense.