Thanks, I appreciate the feedback. I personally really like the voicing, but yeah, if that's an issue for you they can be turned off in Settings without losing the music or sound effects. No argument that authentic VAs are far superior!
The red text indicates that the guaranteed risk gain is high, walkins are random though (albeit mediated by a character's suspicion, which makes them more likely to walk in on you). So yeah, while you can shape your odds but the only way to make an action entirely risk free is to develop other character's stats to the point that they're comfortbable with what you're doing.