I suspect that the removal of ownship position from Arrival/Approach charts etc. may be in some way down to the position of the charting solution provider's desire to meet obligations set out in the latest CRD to NPA 2012-02 (that proposes a new AMC20-25) for Commercial Air Transport.
In essence, for CAT this means that (subject to certain criteria), AMMD (Airport Moving Map Display) may be used (not as a primary means, mind) in conjunction with other approved means of ground navigation (i.e. Taxiing) as a Class B software application. Most definitely not (at this current moment in time) for any other phase of flight......therefore, what BizJetJock said ;-).
I posted the above so that if you get very bored, you can Google the above documents and see the length and breadth of development currently occurring with EFB's.......
- if your private cat. ops., do what you like lol!