I'm not sure the complication is what you think it is.
However, I know why they're doing it. The Tablet market itself has not materialized to be the over-whelming replace every computer market that Apple and many onced believed. They've become companion products for most people. The market has continuously been shrinking, even on the most part for Apple
The reason why everyone, including Apple are going for these "hybrid devices" is because there's recognition that people on the most part are using both. So they're trying to appeal to the "buy one device, that acts as both". Yes, EVEN Apple is doing it with the iPad pro and it's dockable keyboards and Stylus,
I'm willing to bet that the bump up in sales of iPads is temporary, and is more driven by the new iPad that has a great price (Probably their only product that's reasonably priced), to replace peoples 4s (most sold version IIRC) and AIR's, both of which today don't run well anymore due to their low memory.