Different teams in different locations, told to you at registration time?
The issue winds up being that going to the labs and networking with other devs are the two actual values of attending WWDC in person, so splitting the conference up into multiple locations is risky. Why would I want to watch a video feed at a conference center vs a live stream at my office or at home in my PJs?
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Spoil-sport
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They don't. Some products like iPhone have enough changes (and contractual commitments by both Apple and consumers) to be worth releasing yearly. For nearly every Apple product, it is about releasing when it is ready, and apple targets 'meaningful updates' (such as 4k an apps to aTV, a larger screen and ECG to a watch, retina and usb-c and T2/touchid to a MacBook Air, etc).
To put a different way, there isn't another company selling Macs where you would buy non-Apple because one has an intel CPU with a slight speed bump. PC makers have to compete on specs and price, Apple has an entirely separate ecosystem to attract and keep buyers.
Absolute bull. They are selling a 6 year old machine at full cost from 6 years ago, causing a whole market segment to abandon their products. They are in fact competing with PCs