Papa's post was very fair. Projects really can't be left in a MIDI-only state. I know people manage to make decent mixes without ever rendering their soft synths to audio tracks, but I really don't know how they succeed.
My projects always end up with archived MIDI tracks, and audio tracks for each MIDI track - and those are the ones I've mixed for the final 2-track master. The whole lot gets archived on disc.
MIDI can be so ephemeral, with synths maybe no longer functioning or even in existence. You want to have good, dry audio tracks of all that work to archive, maybe work with again, without relying on starting from scratch again, trying to wrangle together your synths etc.
rbowser