Trust alone isn't enough to make a cryptic message not cryptic. I can 100% trust someone, but still be scared when they send cryptic messages like that. With a cryptic message, you won`t be able to predict what they are going to say, and they still might have to deliver bad news like "X has been fired", "X has passed away", "there was a critical failure in product Y", "our department has been having financial problems and we will have to layoff you and your team"... Not to mention the asymmetric power relationship, which exists regardless of trust.
If my wife sends me a “we need to talk after work” then I’ll be scared shitless even if I trust her with my life. Or if my mom sends me a calendar invite for a “quick life update”. It has nothing to do with trust. It’s just good communication to state what it is you need to talk about.
