Development trajectory - how so-called smartphones are developed.

I've been writing about a 'development trajectory' before, but never really explained what's meant by that. Basically it's a way to describe tendencies which seems to be both how various brands (and sub-brands) compete among themselves, but also the 'ballpark' or 'playing field' on which new (or 'new') models are designed: Imagine you should make a new, sellable phone today. You need to come up with something 'new', that's sellable, limit development costs, and yet still be able to do everything the consumer expects. Smartphones are - for reasons unknown - thought to be 'cutting edge' technology. Constantly launching (and pipelining) new models feeds this narrative. You'll probably end up with a version which is 'more of the same', cranking up numbers, not really toying too much with the general concept. That seems to be the case with most phone brands, anyhow, some of them aiming their phones as certain s...