...and now the ability to change seats during online check-in seems to have vanished.
It all looks completely different than how I remember the website and app looking from when I last flew, but at least back then it seemed to work.
And, apparently, for United it's difficult to count to three; here's
flight 3 of 2:
ADDED:
I was able to change seats in the App during online check-in. It didn't work at the united.com website.