The online publication represents the official publication of research results. It is not simply a prepublication service on the part of the publisher. As soon as an article is published online, it is citable and quotable. If changes are then made, confusion can easily arise, with authors citing different versions of the same publication.
Springer has therefore decided not to make systematic use of the technical possibilities that an online publication offers and not to simply replace a published document with an updated one. After online publication, further changes can only be made in the form of an Erratum, which will be hyper-linked to the article.