Oh dear. Those websites coded with Office are a nightmare -- Office created HTML files are so inefficient, what with all the redundant formatting codes Office puts in. I've seen HTML files that were 10 times the needed size because of all the Office code bloat.
I think 10 pages in TextEdit is perhaps doable, but I get your point that longer, more complex documents benefit from advanced features.
However, the problem with Office is that they became feature complete way back in, oh, I don't know, around 2000. I actually still use Word 2000, and I know I could easily write a dissertation using that. Newer versions like 2007 and 2010 added things like Ribbons that maybe made things a bit easier to do, but haven't really added any new functions that people actually need. I mean, I work for a law firm where most of the daily word processing is being done on a version of WordPerfect that I think is from the late 90s.
The point is that on tablets, you really only need basic word processing functions. Any complex formatting and styling can be done back on a desktop. Some people think they need the full Office functionality on a tablet, but the crucial limiting factor on a tablet is the screen size. If I'm working on a complex spreadsheet, I don't even want to do it on a 13 inch laptop if I can help it, I want my 27 inch iMac. Tablets are good for rough drafts and quick edits while on the go, and for that, you don't need the full Office.
Apple realizes this, so they built iWork or iOS with less features than iWork for desktop, but made sure that the features that were there are easy to use on a touch screen. Similarly, other 3rd party office alternative apps also offer a limited feature set than Office itself, but most users are finding that that is all they need ON A TABLET.
Microsoft, in the meanwhile, dithered and dithered, partly because they wanted to keep Office exclusive to Win8 / Surface, and partly because they thought Office for tablets needed to be the full Office. And by now, it's too late. While they were dithering, a lot of people found that they don't actually need the full Office to do their everyday tasks. People used to buy Office for their home computers because that was what they had at work, even though Office was very much overkill for home use. Those people will no longer buy Office for their personal tablets. How much will that hurt Microsoft? We'll see!