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In fact I think requiring an expiry date is a huge negative of the spec and will likely hinder adoption.

An expiry date brings along with it yet another maintenance burden for questionable benefit.

Well, the spec only recommends that the date be no further than a year into the future.

So if you really don't want the burden, just set a date in the year 9999 or something.

It would be way better to not have to "game" the value there if it is going to be garbage data.

Forcing work arounds in implementations so your spec is simpler is the epitome of why standards and specs fail so much.

Design is hard. Good design makes implementation simple.