This is definitely the wish list, and we welcome user requests! However, not all wishes will or can be granted. 
In this case SilverDragon’s reply was spot-on. It’s not possible to bring all macOS features to iOS, because iOS is a very different platform and has a lot less depth (no menus, fewer ways to get to extra features). If you compare the iOS version to the macOS version, then the former will always be “incomplete”. What we tried to do, however, was bring all of the core features to iOS, and build the iOS version around iOS UI standards. Snaphots is one of the features that doesn’t fit very well into the iOS version. I never say never, so it might be that I one day find a way of implementing Snapshots on iOS, but it’s not something that I’ll be able to add any time soon.
Thanks and all the best,
Keith