Board Thread:Versus Debates/@comment-26704954-20160301064038/@comment-9782468-20160307151339

@Minato, it matters because of this:

Each Edo only has a maximum chakra level of what they had in life. So if they try to use a jutsu that requires more chakra than that, the justu will fail because they don't meet the chakra requirements.

All the infinite refill does is allow them to use the techniques they've always been capable of dong, several times.