Yes, but leaf, while what you said is true, the real-life application for crouching before receiving an attack is not to increase inertia in order to prevent launching, but rather to brace for impact. Humans usually stand upon two legs, which is an unwieldy and unbalanced position from which it is simple to lose your balance. CCing, or rather, bracing yourself by positioning yourself closer to the ground, allows you to resist an outside force by bracing yourself against an impact, along with balancing yourself far more steadily upon not two legs, but four. Not only that, crouching allows you to lower your center of gravity closer to the ground, meaning that it is harder to tip you over. While inertia is indeed lowered by bringing in your appendages, the fact is that crouching doesn't actually do this (look at snake, for example), and the main purpose of crouching is to lower your center of gravity to be more balanced. A lower center of gravity means a smaller force of gravity vector, meaning that a much greater angle of tilt is necessary in order to cause you to become unbalanced.
CROSS COUNTER!
I'm sorry it had to be done.
The point though ark, is that in Smash, the engine of CC hinders certain characters way more than it helps and you know. Reworking alot of Brawl+ as we would have to backtrack and retweak.