I'm also an oldschooler with a desktop PC, so I feel you. But, liking it or not, the mobile gaming is a way larger market than the windows market; so it makes sense to develop and focus on the mobile scene.
Also, Splinterlands is a fast game, way more similar to mobile games than fully-fledged PC games.
That's true. And it's definitely a plus to build for all markets and demographics. Next couple of months/years will be epic :o).
I first got into the game on mobile interesting enough. I tend to do a fair bit of commuting to school/work, so it works well for me on mobile.