MobileFrontend has replaced the old Ruby software and it is doing well. The amount of traffic it is handling continues to grow and the software is coping well. The development was concentrating on replacing the existing functionality and as it is freed of these shackles, new opportunities arise.
The MobileFrontend has been available for testing for a considerable time at the bottom of all Wiki pages and what did not happen was include this in the mobile statistics. This is sad not only because we did not only learn how much it was used during the test period, it did not start recording the data when it became used for real.
When the data is obviously, utterly wrong, it is a good practice to approximate what the data would have been. While such data is not absolutely right, it does provide workable data. It does provide the information management can rely on.
As it is there may be other data that is still not measured. There are mobile apps that use the API to request data. Do not forget that MobileFrontend does now support Wiktionary, Wikibooks, Wikisource and all the other projects as well...