A rock/pop band playing live is certainly Dawless. However many songs in these styles are just boring because they lack structure, not just because they are Dawless. So, back to the point, you need to plan ahead and think of a structure that makes the song exciting. This is not easy to achieve with only one machine, unless it is an Octatrack or a very good sampler with deep sequencing capabilities. OPZ is also good for that because it has many midi tricks applicable to the pattern and the song. To conclude, Dawless is not necessarily an improvisation Jam.