It's kind of a hard question to answer broadly, isn't it? The kind of roleplay that makes threats or combat engaging is probably pretty close to the same that makes dialogue engaging; poses or emotes that convey state of mind and make me feel immersed in the moment that we're sharing together as RP partners. I'd take being kidnapped and drug somewhere to be threatened, dismembered, etc. over just being jumped and red-texted to the vat any day.
Think of every great action scene. The moment when swords are crossed or people are ducked behind cover reloading, shouting taunts at one another or just taking a moment to show off how badass they are. Think of slasher movies where the killer slowly walks up on their victim, their knife gleaming while their body is silhouetted in shadow, the victim ineffectually holding a hand up to shield themselves while begging for their life. Now, imagine both those situations in Sindome, where it's effectively just two or more people watching a red text scroll on screen with limited input until the dust settles.
Other than the dopamine hit you get from coming out ahead and seeing a murder plot come to fruition, what's the satisfaction to be gained there? Think of your victim, what opportunity to derive some entertainment for themselves out of this interaction did you give them?