New
#61
Domain Join is the main thing that might be useful (even necessary) for some students.
Backup and Restore *is in all versions* as the chart shows. It's only the additional ability to do it *to a network* that's in Professional and up, as the chart shows. Most home users don't do that.
XP Mode is a separate downloadable add-on. It's not built in, and most home users aren't going to need it as they don't have the custom applications that are most likely to require it. It's nice to have the ability just in case, but it's doubtful many will ever find need to even download the add-on.
Anyway, when it's the same price, you don't lose out on anything by doing the Professional version instead. It's simply that the vast majority of home/student users are going to have zero need for the additional features -- really only perhaps the Domain Join.