I agree with most of what you are trying to get across, except that I think there are a few problems when applied to the issue at hand (footnotes on iPad Pages).
1) Yes, I agree the OP could have found out. I haven't bought an iPad yet, and this is one of the reasons (along with issues with Keynote), and the fact that I until these things are solved, my MacBook Pro works fine. However, here are a few lines right from Apple's product page on the iTunes store...
- View and edit existing documents by importing Pages '09 or Microsoft Word files from Mail attachments or web.
- Share your work by exporting to Pages '09, Microsoft Word, or PDF and sending it via Mail. …
- Transfer documents between Mac or PC and your iPad using File Sharing in iTunes.
Now, combine that with the fact that this isn't called 'Pages Lite' or iPadMiniWrite... one sure gets the impression that things are going to be more seamless. Not even a little asterisk noting some feature difference in files or that you lose certain document aspects when going back and fourth. You'd have to be fairly tech-savvy to pick up the word 'export' and 'import' and imply this from that. One would guess that for MS Word or some other word processor, but not when the app has the same name and the above statements are made.
2) Yes, I realize footnotes aren't trivial, but they are a basic feature of every word-processor I've ever used (mail merge probably as well)..... I'm pretty sure even back on computers with several times less processing power and RAM than the iPad has. There are some incredibly complex applications for the iPad. Unless there is some really crazy limitation I can't conceive of, footnotes aren't a technical limitation issue.
3) I'm not blaming Apple for anything other than being pretty unclear about this. Make it clear... then let the user decide. While I love Apple, this is walking a pretty fine line near deception IMO. I do remember finding this out and being somewhat ******-off at the time because I had been tricked after the keynote (speech), and reading EVERYTHING I could find on the topic. This didn't come out until some real reviewers got their hands on one and discovered and exposed it. I certainly wasn't the only one who was shocked by this. That isn't cool, and isn't the Apple I know.
4) I don't really think it is an unfair complaint. This is something Apple should implement (and hopefully will)... and be clear about until then. At the very least, if the iPad can't support footnotes, it should at least somehow preserve them in the file so that if you save and go back to the desktop, it hasn't stripped them out.
BTW, sorry for inferring you were a fanboy... and welcome to the world of Apple. I think you'll find that long-time Apple users can be extremely critical of Apple products when we feel they aren't living up to expectations in some way. And, believe it or not, Apple often does listen..... which I think is at least part of what has made them a great company.