Apple refreshed its tablet line-up with new iPad Air and iPad mini models this week in a bid to revive its stagnant tablet business. The announcement came rather unceremoniously by way of a press release, indicating the shrinking status of the iPad in Apple's product line-up.

While still the best-selling tablet in the world, the iPad has lost a bit of its magic in recent years. Unit sales have declined for five consecutive years since 2013, as longer upgrade cycles compared to phones and the rise of phablets thwarted tablet sales after three years of blockbuster growth.