The requirement of support for 10 years and more introduces completely new problems compared to consumer electronics. In one or two years, for example, some inconvenience... simply do not have enough time to emerge, while others end up being accepted by the customer, who will "change it soon".
In the case of professional devices, such as those of electronic ticketing, things are just more complex. First, there is the natural aging: rules not different from those of us human beings are valid also for electronics. Then, in so long period, we can assume that the conditions of the context may change, for example the passage from one generation to the other of the telephone standards, the implementation of the company networks, the expectations of the Customers and so on.
There is also the possibility that the device is affected by original defects that appear only after a certain period of time. We are talking about sophisticated objects, made up of hundreds or even thousands of components and with complex software, for which it is impossible to test all combinations of conditions (sometimes faulty behavior is discovered by chance without anyone having detected it).