> This shall not prevent any technical storage or access for the sole purpose of carrying out or facilitating the transmission of a communication over an electronic communications network, or as strictly necessary in order to provide an information society service explicitly requested by the subscriber or user.
This is the reason why these are usually separated to "strictly necessary" and "functional" cookies. Functional cookies are things which enhance the functionality, but are not strictly necessary. These would generally include things like persistent cookie for language choice rather than just session one.