For me it’s not an issue of trust, it’s an issue of being able to correctly assess difficulty and make informed decisions. Failing when you don’t know the DC just feels like bad luck (assuming you trust that the DM set the DC fairly. If you don’t it feels like you were cheated. That’s not what I’m worried about though, my players trust me too.) Failing when you know the DC feels like taking a calculated risk that didn’t pay off. You feel like you have a greater degree of agency and own your successes and your failures, and that’s a feeling I want to foster at my table. It’s not to everyone’s liking of course, and that’s fine, but to me it’s very important.