Hi
That stems way seems a bit clunky. I know that sometimes for production purposes stems are the way to go, but sometimes one simply wants to mix a bunch of tracks down to just one track. That could be the whole set of tracks, or just the strings, brass, winds or percussion - for example. That is possible I think in many other DAWs, and some of them will even do this non-destructively. The export to Audacity method is OK, but then if one just wanted on track , the mixing would have to be done in Audacity - which raises the inevitable question once more - "Why didn't you just use Audacity in the first place?".
It is also possible in some DAWs to combine Midi tracks into a new Midi track I think, though obviously that might not work for all instruments, but sometimes that can be useful. The bounce out doesn't always have to be to audio, though perhaps it usually will be. Sometimes one is simply trying to make handling a lot of tracks more manageable, yet not losing the project or producing versions which are limited in CPU performance. For example, one might want to bounce the brass section to audio, but keep the original Midis or even separate audio tracks, for performance reasons. Then later on one might want to render the whole thing but this time not using the temporary bounced tracks - but here the rendering might not be done in real time - to avoid overloading the CPU.
OK - sorry - I'm being picky, but I've found things I do like in LMMS, and I keep hoping that it will do some of the things that other DAWs make possible, but keep coming up against walls to knock down.