Digitigrade is one type of legs (other are Plantigrade and Ungulate).
For me, Digitigrades are not only shape of legs but also useful part. It being because I want Digitigrade Stilts to give my legs Digitigrade shape.
Yes, it will make it harder to keep balance (including wings) and then I have decided to make it even worse with PawPrints.
By the way, you can make your Digitigrade Stilts yourself - look at Instructables. I decided against it because I could not decide on material or design. I am also not convinced in my abilities to make them myself.