I would expect color issues from (non-)calibration using a tablet or a laptop computer, even if you move just a little and the sun or the light source in your room is in a different angle than it was previously. But that's the least of your problems, in my estimation. I also have some doubts as to whether the calibration products available today can be installed on a tablet computer.
To me, he biggest issue is 'horsepower', AKA, processor speed and RAM. Without enough of each, your wait time to do any photo editing will be measured in seconds for each click. Set WB...wait... crop...wait... sharpen...wait... You get the idea.
I was perfectly happy with a 1.4ghz single processor desktop computer with Windows 2000 running a freebie "light edition" Photoshop that came with my Canon G-3...a 3mp camera. It was still OK when I upgraded to the 5mp G-5. I later upgraded my computer to 3.0ghz Windows XP that was satisfactory for doing of 8mp shots from the 30D, and was "OK" with the sometimes-too-slow computer after moving to the 18mp 60D. Fortunately, I upgraded my computer to a 4.1ghz quad processor(slightly overclocked to 4.6ghz), 8gb RAM computer before I upgraded to a 5Diii and it's 23mp sensor. I've since upgraded again to an overclocked quad processor at 4.9ghz and 16gb of RAM. My wait time for each action is consistently less than 1/2 second.
The issue, therefore, is how long would you like to wait between each mouse click? And if when you consider that the number of megapixels in the newest digital cameras double about every 4-5 years, how many horses will be needed to process shots from a 43mp camera? Or a 100mp camera?
And don't forget storage of all those photographs. I use a 128gb SSD for my 'in process' photos for fast access. My library is an almost-full 1tb drive, and I've just ordered a new 3tb external drive as the first step in moving to 3tb drives. Note that as I am not a gamer, I have a cheapo, fanless video card that's more than sufficient in my mind.