What would be the upside for SoundCloud?

Anybody making any sort of music has already dabbled with a number of tools, has preferences and tastes in this area, some dearly paid-for gear, etc. Offering an entry-level DAW won't make sense. A pro-level DAW could be a welcome upgrade for some, but...

But audio is a low-latency thing. It's hard to implement from within a browser, to say nothing of running VST plugins. It's damn hard to maintain a proper desktop app even for one platform, and it will always miss some feature a competitor has.

And SoundCloud would invest into it for what reason? For what bottom line gains?

I fail to see so far.