Forcemasters in BnS Neo are faced with a feelsbad decision when it comes to their builds. As an Ice Force master using Ice rain, you want to spec into blazing palm. Herioc (purple) tier and above gives a very nice dps buff for your build by auto detonating ember stacks for extra damage. This is a huge boon for the individual, but it greatly hinders other force masters running either of the other two fire builds (Blazing Beam & Dragon Char).
This is the only instance of anti synergy like this that I know where having a team member running a specific skill can negatively affect another member's dps.
I would love to see ember stacks be tracked on the boss individually (instead of shared) or something similar so that a simple choice to benefit your own build does not feel bad for the other people you are playing with. It creates a situation where other players would not want to play with you if you are running that specific skill and you do not want to run that specific skill for group content even though it would make you stronger.