There seems to be a significant shift in the way people treat their promises these days. In the
[[MiddleAge]], when two knights agreed to rendezvous in Paris after spending ten years on battlefields, they
had no choice other than to be at the designated place at the designated time.
Otherwise, there would be no chance that they would ever see each other again. The [[MiddleAge]] promise
could last years.

Nowadays, when you want to meet with someone, you
simply negotiate the approximate date and an hour of the meeting and phone the other to confirm validity
and settle details. Mobile phones are the root cause of modern people being able to break their original
promises!

This affects how the whole society behaves and also how (lightly) many developers treat their promise
of [[BackwardCompatibility]].