Great point! Why on earth would Apple not include a lightning connector?
Why
would they include a lightning connector?
The real question is, how long will they continue to use the Lightning connector on iDevices now that there is a standard, USB-C (partly designed by Apple), that solves all the problems with Mini/Micro USB. Really, they should have switched to USB-C with the iPhone 7 before making everybody buy lightning headphones/adapters.
Also, MagSafe has been the best thing EVER for laptops. Why on earth would they remove this?
Because:
(a) laptops have got smaller & lighter and now can easily be pulled off the table by a magnet (heck, its not inbfallible with a larger laptop: my MBP 17" took a dirt nap because someone tripped over the cable wrong),
(b) laptops now have all-working-day battery life so you don't need to keep pugging them in at meetings etc.
(c) there is now a 'universal laptop charger' connection in the form of USB-C - lots of people will now charge via. a 3rd party USB-C docking station.
All USB-C is an example of uniformity but the need to use adapters for everything decries any claim to simplicity.
Except we've never had anything quite like USB-C/TB3 before, that provides a
first class connection for USB3, Thunderbolt, DisplayPort, HDMI and power via a single, industry-standard connector that only needs
passive cables and adapters. (Not sure if the recently announced HDMI-over-USB-C mode will be supported by the next wave of Macs, so that one might need an active DP-to-HDMI adapter - but they are already on the market - everything else is basically just a cable). There's already a better choice of USB-C cables and hubs than there ever was for Thunderbolt, and the prices are getting lower.
Short-term, yes, there will be a bit of adapter pain, but long-term the smart money is on USB-C becoming ubiquitous and, thing is, a major laptop brand like Apple going USB-C-or-bust
will speed up that process - just like the original iMac helped kickstart the uptake of USB: PCs had dusty, unused USB ports for a year or so before the iMac, but since they also had RS232, Centronics, PS/2 etc. there was no real incentive to use them (or for MS to sort out the Win95 USB driver hell).
As for simple: I have a (fairly typical) PC motherboard which has one of each of DisplayPort, HDMI, DVI and VGA sockets - great, huh - until you want to connect 2 HDMI screens and find out that none of the ports support adapters (because that's probably how they're implemented internally) and that there are arcane rules about which 2-3 of the 4 ports you can use together. The only connector its got more than one of is USB - and even then its a mix of USB 2 & 3. So, yeah, "I've got a new Mac so, to connect X I need a USB-C to X cable/adapter which will go into any free socket" is pretty simple.
That said - the leaked cases for the new rMBPs were the same basic shape, but slightly thinner, as the existing ones, so they
haven't gone for an Air/rMB-style tapered design which is what
really reduces the space for ports. Keeping MagSafe, a 3.5mm jack/optical socket and maybe one USB-A port wouldn't be a
bad thing.