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With Di2 eTube (2 wire), You can take a 10 speed Ultegra setup, change the mechs, cassette and chain for 11 speed and keep the same shifters, controller (junction-A or display unit), battery and cabling. That's a whole bunch of non-obsolescent stuff.
Emyr-
Apparently the old 10 speed shifters only work with 11 speed stuff if they weren't updated to the latest firmware version, so you do have to be careful, but yeah for the most part they'll work
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Apparently the old 10 speed shifters only work with 11 speed stuff if they weren't updated to the latest firmware version, so you do have to be careful, but yeah for the most part they'll work
boredom
The advantage to my eyes is that you could do 8-speed electronic, or upgrade your 11-speed stuff to 12-speed with just a new cassette and chain, or replace your derailleur for £20 instead of £100, or whatever.
If you've got 10-speed Di2 and want to switch to 11-speed you have to buy a whole new bunch of parts. IMO that is because of planned obsolescence and greed and nothing else; I'm 99% sure that they could have upgraded them to 11-speed through firmware alone. In fact they used to work on 11-speed before Shimano disabled it. How likely is it that current 11-speed eTap is going to work with 12-speed stuff? Not a chance in hell.