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I believe a touch screen mechanic that has excellent response times would completely offset the need for a mouse in mouse pve content. THat is unless you`re forced to use your Razer Mamba to play effectively.
I actually prefer the all-keyboard mechanic in FFXI and hope it is usable in FFXIV after the touch mechanic is installed. This just makes things like equiping and doing other things that a mouse is used for more fluid when simply using the kb.