Thanks for posting this article. It's short & to the point.
I wasn't thinking about the fact that if you choose a night time show as your next, you'd forgo the opportunity to have any other FPs before then since you have to use one before reserving the next..good to know.
What I'm hoping will happen when they add the hopper option is that if you don't want to use your current one, you will be able to reschedule it for an attraction at the park you'll be hopping to before you get there or as soon as you get there. Although I haven't tried, I have read that you currently can go to a kiosk in a park & see/change ones you made for another park.
I'd book the FPs for that 1st evening at Epcot. If you have to wait to book them for your last day, it should be fine. Why waste one day of FPs?
No, they are not connected. People have been emailing the reservation to themselves by copying & pasting or taking a screen shot w/their phones just in case.