Most of the time, NFL teams want to keep their NFL Draft plans close to the vest.
If you're a team like, say, the Tennessee Titans — who own the No. 1 overall pick in April's draft — you don't want other squads to know your intentions in advance. It could ruin potential negotiating positions in trades. It could muddy up plans to draft other prospects later in the draft. It's an advantageous place that could be ruined with the slightest over-share. Of course, that's not necessarily always a problem. If you have your guy, you have your guy.