Pajama is intended to be a "music sketchpad". The goal is to allow discovery and capture of musical ideas with as little friction as possible. There are plenty of options for music notation software, or professional-level DAWs, but I've found them to be cumbersome enough that I get bogged down in fighting the interface or trying to learn the "best way" to do things, and it gets in the way of making music.
This program is not intended to be a replacement for more professional level audio production software. I haven't implemented midi export yet, but the idea is that you can take these "sketches" from pajama and export them for further development with a more fully-featured DAW.