From a theoretical point of view, mixing and then consolidating your outputs not only reduce your own anonymity set, but also the other coinjoin participants. So it's an harmful practice.
Think of a coinjoin with three people, if Alice and Bob consolidate their coins after the mix, also Charlie, who is diligently spending his coin consciously without consolidating, has his anonymity set almost destroyed.
You have to take into account this "negative externality" when consolidating.