In traditional schools only a variant of the prescriptive grammar is taught and accepted. In Sudbury schools we allow students to choose whether or not to learn and use prescriptive grammar and to what extent. There are different reasons one might decide to use or not use prescriptive grammar. Prescriptive grammar is useful in formal situations, but its overuse can be off-putting at times. One could also argue that there are few situations where it would be very unseemly to end a sentence in a preposition or use “who” as an object of a sentence.
When people are allowed to choose how they wish to speak, they are better able to articulate themselves in a manner they see as appropriate to the situation and are better equipped to determine what the appropriate tone is for any situation in the future.