People can submit arbitrary information besides the fields I specified on the form, you know. :) It also documents the parameters I expect to have to some degree - much easier to find them all there than search the file for ->param( and much more unlikely that I'll forget to untaint something if I explicitly ask for everything in one place rather than scatter param calls here, there and everywhere. Consider it an approximation of being strict about my form parameters.

Makeshifts last the longest.