Every country you hold a passport for, perhaps. But not true for all. Not that we're getting into a pissing contest, but my son has 4 and I can tell you with certainty that it's not every country.
Yeah, typo. Sure, slightly trickier to set up, but better in some ways than a DTV, and many who can pay for an Elite would qualify. And if one has time, then it's a sensible option. Time was the issue on my side, but I'd have preferred it. If they ever make that BOI portion properly more straightforward, I could see a shift towards it.
Not yet, but noted on both of my children's visas that the passport will expire soon (they are 5 year only). Full validity of the visa given, so one might presume they expect you'll need to enter with both old and new passports in future. I gather if a passport is lost, one might also need a photo of the old.