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As far as I can tell, they seem a lot more fractious and less structured than the loyalist chapters. They serve Chaos, after all. But I assume it also varies by individual legion: their mentality, how much of their strength survived the Horus Heresy and the ensuing Long War, whether they still have a Primarch whose leadership is beyond challenge, etc.

I get the sense that, without a Black Crusade to force them to get their ducks in a row, some legions effectively exist more as a shared legacy and martial philosophy than a proper organization. The Night Lords lost their Primarch, and I wouldn't be able to tell you who's their head honcho now without looking it up. The World Eaters are nominally led by Angron, but he doesn't strike me as the micromanaging type.

The Thousand Sons are probably fairly cohesive: they still have a Primarch (one of the more intelligent and proactive ones, too), and most of them are mindless automatons anyway. I'm guessing the Iron Warriors also have a formal chain of command, because it makes things Efficient. Not sure about the Alpha Legion... They're duplicitous, but they also seem very akin to a hive mind ("I am Alpharius").

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I think the power structures in the traitor legions largely understand it would be pointless to implode with infighting. Those who are more short sighted inevitably get put down. That’s doesn’t mean internal conflict doesn’t exist, Infact I think it’s encouraged to weed out the weak and let the strongest move to the top.

It varies.

Some entirely shattered, such as the World Eaters. Some remain almost entirely whole, such as the Iron Warriors.

Alpha Legion? It’s impossible to tell due to their very nature. Plans within plans within plans.

I’d say your best bet to look up each Legion in turn, and read its post-Heresy history.

As stated it largely depends. The main thing to remember is that regardless of legacy, all the Traitor Legions obey the primary rule of renegades and traitors, only the strong rule.

The Legions with the greatest cohesion are:
- The Black Legion: Due to the cult of personality and personal power of Abaddon.
- The Death Guard:Though they are still very much split between Mortarion and Typhus in terms of alliegence.
- The Iron Warriors: Entirely down to Perturabo's force of will and post-Heresy the survival of the fittest mentality only got worse.
- The Thousand Sons: Though this is only after the events of Gathering Storm where Magnus united the Legion to try and destroy the Wolves.
- The Word Bearers: The Legion is united in name rather than spirit, with individual warbands fighting to determine which is the most "holy" shade of red to paint their armour (that is 100% true btw)

The Legions will middling cohesion are:
- The Emperor's Children: Fulgrim doesn't really care about the Legion while after Skalathrax and Harmony, the powerhouses of the Legion were generally adrift. The Phoenix Council does exist but they're basically just there as a political entity to make sure they're involved in Abaddon's plans.
- The Alpha Legion: On paper they're all aligned with the same goal, how they go about this goal is entirely chaotic. But at least they have rules and regulations that are adhered to when determining Harrowmasters.

The Legions with little to no cohesion:
- The World Eaters: Not much to say about them. They barely had it as a weapon of the Imperiumm
- The Night Lords: After Curze died the Legion fractured entirely. They'll show up as individual warbands to a warzone and very very rarely operate in numbers larger than a single ship. They all hate each other and often actively try to murder each other.

Regardless of the above, each warband will have its own beliefs in terms of how much lip service is paid to their parent Legion and who they actually owe allegiance to. Many swear to Abaddon while wearing their original colours, others to whatever Warlord brings them power, glory, or resources.