[dragonwriter]

> The issue with it is that Sun's writings are not used as guidance for war

Yes, they are.

> it's used as guidance for X.

To the extent that's a problem (and for some values of X it is), it is not a problem with the writing, but with the use.

> If it was used as guidance for war, it would be popular in military circles

It (and newer works grounded in part in it and/or intermediary sources derived in part from it) is.