Honestly I’d the Asus built an x16 capable open standard connector, and preinstalled a Linux OS on the Ally I would buy it over the Deck.
That I feel would be a truly innovative product that pushes forward the status quo and the least common denominator for the portable market.
I tried to express that in my survey
The egpu would be compelling if it didn’t lock you in to proprietary hardware.
I could ditch my gaming PC if I could dock it and play at 4k.