This will lead to the use of the document to in some ways force the technology producer to a specific behavior. The field of software engineering clearly does not fit into this document. However, internal technology constraints may make this impossible to use or not advisable. Some vendors stop supporting patches for software products and the change to a new major version would force the victim organization to change the whole setup. The question of how long a specific system is supported is important.
Folks are interested in the length of time as measured in calendar time as opposed to versions.
So, for example, some vendors state that they support the current versions and the two preceding ones. The problem is that the buyer doesn't know how long a period of time this might cover. From a strategic and financial planning point of view if would be very helpful to know, rather, how long in real time an organization can count on support for the product. What about products that are sold but are no longer supported or dropped from the list of supported products shortly after purchase. The feeling was also that security problems have to be addressed, even without a service agreement.