You mean, a bag full of dongles can do the job?
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And a USB to hdmi adapter for projectors. And usb to usb-a adapter for memory sticks. and usb to sd card adapter for sd cards. And usb to more usb when you immediately run out of places to plug in even more dongles. I'll name the new Macbook 'hedgehog'.
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Wrong. The only loss is your bag space. In the future you'll be carrying even more dongles around, making that 13" macbook pro take up more actual space than a 17" HP Zbook and weighing as much. Progress, you say? Future, you say? You can have your future and eat it. With dongles.
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Put in an USB-C cable in your machine, connect the other end to something that will stay put (like a wall wart) and then go and kick the the cable. Go buy a new computer and consider the benefits of MagSafe. With luck you'll only break the port, with less you just lost everything you hadn't backed up.
Clueless people whine about MagSafe. Everyone else knows it'll stay put just as well as pretty much any other charging cable but the benefit is that in an accident you won't destroy your computer. No matter whether the person walking into your charging cable is a colleague, dog a toddler or a stampeding elephant.
Having lived with an rMB for over a year now, I really wonder where all your anger is coming from. I have LESS dongles now than when I was using my MBA as my primary work machine. With the rMB, I only have one, a tidy 3 USB-A + 1 Ethernet + 1 HDMI. It's so close to the same size as my old Apple TB to Ethernet dongle as doesn't make any difference. When at my own desk, I charge directly from one of the USB-A ports, and have two left over for general use. I have used the dongle twice while on the move, once to print while out at a client, and once to connect to another clients secure LAN.
USB-C peripherals are already numerous. You can get USB-C thumb drives everywhere, lots of the no larger than your thumbnail, there are even lots of smart designs that have both A and C. USB-C monitors have also started to show up on the market in the last few months.
As for MagSafe, the idea is that with all new MacBooks have all day battery life, they aren't being designed anymore to be tethered all the time while in use. The need to be plugged in while at a coffee shop, in a meeting, or anywhere away from your main work desk/location has been drastically diminished. I can't remember the last time I needed a charge outside of my nightly routine. It's become like my routine for charging my iPad and iPhone. That's the reasoning behind the phasing out of MagSafe. If Apple still sold laptops with maximum 3-5 hours battery life, they definitely would be keeping MagSafe around. But 10 hours is going to be the minimum from now, so MagSafe becomes much less of a "thing." You're probably still tethered to a charger out of habit, or you own an older generation MBP that doesn't have the improved battery life. In either case the indignant argument you are making just fades away.
Of course this is my use case - yours may be different. But you can't have it both ways. Either Apple innovates and is a leader in bringing new technologies to the market, as they have traditionally done, or they stop being that company and officially lose their way.
If those 4 ports are all fully functional TB3/USB-C ports, the potential connectivity is exponentially greater than anything Apple is selling now, and there is absolutely nothing to complain about that. If you're angry about your existing USB-A and TB2 stuff not working anymore, then I'm sorry. There are also little A-C adopters that aren't expensive and about the size of a stick of Trident you can get.