Musashi devotes an entire book — the Book of Wind — to what rival schools get wrong, and closes it by saying he deliberately avoided naming any of them. He attacks tendencies, not rivals. That is exactly the distance to keep when explaining why your way of working is different.
What I did with it
That is where the "what to demand from whoever sells you this" section on several pages of the site comes from. It never says who does it badly: it says what to ask for, and anyone who cannot provide it is described without my naming them.
The other idea I use daily is his refusal to favour one weapon. Musashi complains about the swordsman who trusts the long sword: he thinks of winning from a distance and is at a disadvantage up close. Translated into my trade, the large integrator wins on reach — team, catalogue, presence — and competing there is losing. Working alone, the advantage is close in: talking to the person who decides with nobody in between, and delivering in days.
And a stopping rule that saved me time: if something has been tried twice the same way and failed, a third attempt with the same method rarely changes the outcome. It is written into my outreach plan — on the third attempt the method changes or the thread closes.
What I left out
Everything else, which is most of it. It is a manual for killing someone with a sword. Easy analogies between duels and business tend to end in calendar quotes.