Because it keeps me informed.

If we're sitting at the gate at the departure airport, I know why (bad component on the plane, flow control on the taxiways, bad weather has closed down the departure runway, etc.).

If we're taxiing forever and a day at the departure airport, I know why (we're at max takeoff weight and need the long runway, which is on the other side of the field).

If we're in a holding pattern over the arrival airport, I know why (bad weather, flow control, etc.).

And the biggest stress reliever - clean clothes because I know whether or not I can order the coffee (in the small china cup) in First or Business because I just got a "ride report" and know what to expect in terms of turbulence ahead.