It’s very basic and common knowledge by modern standards, because it also set a standrad. If you had someone prosecute a war with 0 strategic experience, I would argue for it be a good guide.

Aside from that, most pieces of advise are something you might have to remind yourself of constantly. Break the enemy without fighting is solid and logical advice, but more than often enough it isn’t followed. Do not assault certain positions at all costs is quite obvious, yet we saw absolutely baffling assaults during WW1 or the US Civil War against well entrenched positions across open ground.