I would imagine if you screw up the alternatives your way up sh*t creek without a paddle, or perhaps if components around the alt.points get screwed up then the consoles a goner - and for the most part if you are using an alt. point then it's because you made a pigs ear of the first, and so the smart money says you would stand a chance of ruining surrounding components of the alt.points.
Therefore, they suggested the ones that are in the installation guide so that it would work just fine if done right first time, but you would have options if things went wrong, rather that sending you straight to the alts whereby a single mistake equals dead consoles.
You have to think, these guys know what they are doing, and no electrical design, particularly that which comes with a TX brand, is constructed the way it is without good reason.
That'd be my guess.