Even though DX10.1 brought some performance gain, Ubisoft is removing the support coz "it makes the game unstable".
In other words, it makes the game "unstable" if you want to play it "The Way It's Meant To Be Played"
Ubisoft nixes first DX10.1 support - The INQUIRER
In other words, it makes the game "unstable" if you want to play it "The Way It's Meant To Be Played"
Ubisoft nixes first DX10.1 support - The INQUIRER