It's not that I'm entirely uninterested in creating a mobile client, but even disregarding whether it's worth the work it would require, I've just no idea what form it would take to begin with. Graphical fidelity aside, I think it's safe to say that the primary problem would be the UI. What would a good inventory UI even look like on mobile? I can't imagine hunting and pecking for inventory items on a touchscreen would be a nice experience unless they're so large that you could only fit at most ten on the screen at once. How would you interact with objects without right-clicking? What to do with tooltips?
It's certainly true that I use smartphones little enough that I don't have experience with how other games/programs handle similar problems, so feel free to offer suggestions if you have any, but from my perspective these problems seem almost insurmountable. And frankly, that's the main reason I don't use smartphones any more than absolutely necessary; touchscreens are kinda cancer.
That being said, a top-down view would of course be the easy part.

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Whether that makes the mobile experience better, I'm not sure. :)