It's interesting how the specializations in this book, much more so than in the other CRBs, are so disjointed from each other. Possibly another small balancing factor for the Force using PC? If you want an optimized character (for example, a high-Intellect PC might benefit most from Soresu Defense + Artisan + Sage), you've gotta pay the extra XP for the cross-career specializations.
I wouldn't say it's that disjointed compared to the other books. Barring inherently intellect-focused careers (Technician in EotE, Engineer in AoR), everything follows a similar pattern across the books. Like EotE has Marauder, and if you just want to be about beating people up with high Brawn, Mercenary Soldier, Heavy, and Demolitionist aren't going to be your top picks, and even Bodyguard and Enforcer are barely helping for somebody who just wants to be a beast with Brawn with care for little else. A Sharpshooter/Soldier from AoR might like some of the defensive stuff in Commando, but if they wanted to maximize things that benefit their Agility, they're going to branch out into Gunner/Ace.
It's really just all about what the career itself does and subsequently a base character concept than min/maxing to a certain characteristic.