Because civilians without soldiering skills are available from the Civil Service or contractors (or in extremis the RAF).
2: Do you consider it more important to have a broadcast communications specialst* who is ALSO a soldier 'with the same basic soldiering skills' as everyone else even if that means you only run at 50% strength?
* or any other number of weird 'information warfare' type roles that involves nerds and such sat on the net or making videos.
See above. If they don't need soldiering skills they don't need to be in the Army.