Dash works fine, only thing missing is being pulled into the white construct instead having it superimposed on the game world.
Pinned windows etc etc works no problem.
Yes, and as per my OP, "Better Oculus Dash integration would be one reason".
Pinning windows via Dash in Seemless mode has a massive advantage over trying to pin windows in Void mode - Seemless mode allows you to see where you place the pinned window and is not based on guess work like it is in Void mode. I would hardly describe your experience with Dash as "works with no problem"

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Seemless mode also allows you to interact with applications on the fly while piloting your ship providing you use autofocus to keep the Elite window focused. This opens some very interesting possibilities... for example I have a working "Virtual PDA" that I have developed. It allows me to bring up many bits of information you simply cannot access without being taken out of the cockpit under normal circumstances. It also has a fully functional keyboard which is displayed as soon as you open a chat window and has a working 'enter key' (unlike the natively provided keyboard via Dash), works great with the Galmap too. I can also interact with the station menu UIs (and others) via the Virtual PDA using Touch... Honestly, Seemless mode offers so many possibilities...
Anyway, it's entirely up to you where you launch Elite from but if you reinstall with every update and use Dash in game, would it not make more sense to install the game via Oculus Home so you can use Dash at its full potential?