Dating will probably come to the market sooner or later. But dating isn't really the problem, and adding dates will initially confuse customers more than help them.
Is a one-year old seed more viable than a 5-year old seed? Maybe, but not if is has been left in an unsealed environment where temperatures regularly exceeded 80F/25C. Five-year old seed kept in sealed packaging at stable temps below 40F/5C can typically be expected to be 95-98% viable. Two-year old seed kept on a shelf in a warm room can easily drop below 50% viability. Which makes the odds of someone getting 0/10 germination pretty high.
The conditions under which the seed is stored before being sold to the customer is a far more critical factor in maintaining viability. And truth be told, most "seedbanks" (a very misleading descriptor for seed retailers which implies some technical expertise and practices in seed preservation) don't give a hoot about seed storage.
I see it all the time at dispensaries and canna conferences, seed inventory stored like so much birdseed. It's not their brand after all, it's just inventory to be moved. The breeder suffers the consequences of the seed monger's indifference.
If you want fresh produce, buy it from the farmer....