I feel as though PCs as a gaming medium are becoming more and more mainstream, so I really don't think that's the case, but at least with me, portability really factors into whether I'll be playing a game or not anymore. I blazed through Trails SC, partially because I could play it in bed or take it with me on the go. I don't doubt that if I had bought it on steam it would have taken me a lot longer to finish.
That said, I'll probably buy the third chapter on Steam, portability be damned, because I really like the series and want to support it.
(Also I accidentally uncovered that my wife bought me Trails of Cold Steel as a birthday present! It was tucked away in an Amazon shipment that I had thought only contained a bag of cat litter.)