Whilst its no big deal for MIDI tracks, having a way to purge your session folder of unused audio files is an essential feature for a professional DAW; certainly when it comes to archiving or transferring sessions where you have been doing multiple takes on say a live band, orchestra or even just a well-mic'd drum kit as you end up with gigabytes of junk wav files pretty quickly.
Whilst its no big deal for MIDI tracks, having a way to purge your session folder of unused audio files is an essential feature for a professional DAW; certainly when it comes to archiving or transferring sessions where you have been doing multiple takes on say a live band, orchestra or even just a well-mic'd drum kit as you end up with gigabytes of junk wav files pretty quickly.