Should actor massScale affect all aspects of simulation?

[Qriva0]

Rotational mass = "how much material is there?" and can be understood as the thickness of the rod, as far as physics are concerned.
Compliance = "how soft is the material?", so it sort of modulates the rotational mass.

In other words: having a very thick but soft rod (high mass, high compliance) is similar to having a very thin but hard one (low mass, low compliance). Even if your material has zero compliance, making the rod very thick (high rotational mass) will make it very hard to bend.

Keep in mind however that compliance affects both linear and angular forces. Linear and rotational masses only affect linear and angular forces respectively.

Ok so it's actually a bit different than what I expected.

No. External forces (collisions, wind, gravity, inertial forces, etc) and internal forces (forces that originate inside the object and keep its shape, such as the forces applied by constraints between particles) act on the exact same material (same mass, same compliance) so forces of the same magnitude must result in the same acceleration, regardless of where they originate from.

Think of a foam ball so soft that collapses under its own weight, but that feels hard as concrete when you try to sink your finger on it: this is physically impossible, objects must respond to all forces equally. Any other behavior would mean the object magically changes its mass or its constitutive model depending on the force affecting it, which doesn't make any sense.

Well, physicly speaking what you said is right, but I try think in simulation reality, what I mean here is that simulation has not the same capabilities as real world, and as you said before reality has technically infinite number of substeps, while mine has got like 16
I thought I could combat a bit problem about propagation of forces and rigidity, because simulation requires more steps, the problem is that in reality I could make quite bendable plastic cable it's bending properties would not affect how it behaves when pulled, while in simulation increasing bending also changes how forces move along the rod, because angles and directions are different. On top of that it can even lose stability, because interation does not happen for all points at the same time.
In any case it does not work that way, so there is nothing to do about it.