Edit: Some spelling mistakes.
Edit2: Formatting, something bothered me lol.
TLDR; There are benefits to being both in and out of coherency. Staying in coherency allows the team to react to saves from a dog/trapper/etc much quicker and everyone can benefit from coherency-related traits, but being out of coherency has it’s uses (provided the user running off can handle it) by dealing with threats before they even reach the rest of the team, or simply distracting gunners and other enemies, lessening the burden on the others … but it is more dangerous for sure.
Anyhow, here’s a very detailed explanation below.
- Penances
Simply this. Want this penance? You have to stay out of coherency. I think there are others like this one. It’s probably best to communicate to your team that you’re going for these, they may even help you, or be more welcoming to this playstyle then.
Note: Of course, mistakes can be made, even for the best of us, and it’s a risk they are obviously taking.
- Difficulty
A really good player can handle themselves most of the time, especially with a well-put-together build that allows them to deal with any situation with a degree of proficiency (armored/unarmored/boss enemies alike). As someone who has ran ahead on every difficulty, sometimes I just want to beat a mission quickly (for mission completion penances or something), sometimes I’m doing it to deal with threats before my team gets to it, sometimes I simply just forget how fast I’m going. I’m not always perfect either, and sometimes I do get trapped (sorry!) ¯_(ツ)_/¯
Note: Of course, mistakes can be made, even for the best of us, and it’s a risk they are obviously taking.
- Overconfidence
It’s also probably a mix of this too, but this more-so ties into what I said above. Just because you can do it, doesn’t mean you should in every situation. It might benefit some people to learn when to pull back from time to time. Maybe they already know this and they just happened to make a mistake in your match that day, who knows?
Note: Of course, mistakes can be made, even for the best of us, and it’s a risk they are obviously taking.
- Rolling Steel
This mission is, at most, a 10 minute mission. They’re probably running ahead here to start the bomb-defusals early. If you waste time on that mission, it’s game over. Going down, or generally being a slow/methodical player here is not ideal. I still find myself sometimes failing an Auric HISTG mission on Rolling Steel because of all the specials that are constantly interfering with everything, slowing everything down. Kind of hard to defuse a bomb when the floor is fire and mutants are throwing everyone around lol.
- Coherency - as a whole
There are some talents in the game that are crazy strong when in coherency, and it’s basically how high level Havoc missions are generally tackled lately (most teams that do well generally abuse coherency traits to the max, and it works real well!). Here’s a few that are just simply amazing (PS: I’m using mods for a broader description of talents, so you may not see what I see without certain mods):
Psyker example
Ogryn example
Veteran example
Zealot example
I hope this helped give a good explanation of when coherency and non-coherency can be used effectively 