If you see this the way I do, you'd see that the limit of the machine is what it is, however it could be very powerful if the transfer of data is intended for something much bigger, so we assume the potential is there for Sark as he is to be the same guy in the ENCOM system. I think that the machine doesn't contain his entire conscience, and that ENCOM wasn't capable of making that avatar of Sark fully functional, the MCP would have been up to something in the machine too. So if you're familiar with the dualism approach - one may say it's one reflection of Sark and the MCP, and TRON, possibly more than a game..
Thanks to VRAM who wrote an interesting article on his theory of how Steven forms some of his beliefs, and utilizes information to create this story. "The Home of Tron" have another meaning...
I suggest you check out the information available to draw a better conclusion for yourself.