Maybe because you're too important to put yourself in harm's way- repeatedly- for no real gain.

[Wait, that almost sounded sentimental. Can't have that.]

Rodimus wouldn't know what to do without you. This damn ship is barely holding itself together as is.

[Don't you dare underestimate how hard he is willing to fight over truly petty matters. Including the datapad.]

The only thing I'm hiding is gruesomely detailed scans of every injury you've sustained this whole time we've been out here- I'm really not sure what you're expecting from a medical datapad.