IMHO that is going very far in terms of laws and rights, both internationally and on national and local laws of the world.
In history there have been quite a few lawsuits over patent rights with all the results depending on various circumstances, and of course, being able to prove the originality of an idea is a lot.
In any case, even if the patent was lost, having the idea certified in time before any other, at least one will have something very important: the originality of the idea.
On all this, as I said at the beginning of this message, there have been many disputes in history, some famous ones were carried out by Edison and Tesla, as you surely know.
And again In any case, lets think in the many many different cases where certify de contents and link them to a moment is important. In my opinión it is interesting and useful. Perhaps the time will put the issue in its place........
Just different points of view.
Thanks, regards.