As i see it, rebuild changes are good as for players who play active (interception of the full fleet still hurts but it`s not fatal now) and for players who play passive (now they loose less than earlier).
But i see a problem with reducing amount of rubbles. Yes, it`s absolute logical decision, it`s balancing amount of fleet and etc, but for attacker this change isn`t good as it seems. From POV of attacker every flight is correlation of risk (stable losses and probable losses) and reward. With these changes now the rewards of success are recude in half, yes, probable losses now a little bit less, but attacker still not gonna put himself in a situation, when interception are guaranteed. And attacker still have the same stable losses of spice on flight, and for top fleeters it`s a hundred millions of spice. Every time it`s a decision, build few thousand pheonixes/bs or make 1 flight.
Now fleeter have even less desire to make flights, because most of the flights are still for nothing (most players are still good and don`t let destroy themself easily), and now reward is reduce in half. If u want to make these changes permanently, u have to make flights cheaper. How are u gonna do it, it`s a different topic, but it had to be done just for the balance.