Real world experience "does not count"
It is strange how we over analyse this but peoples posts in the comments are the same: Seagate is really junk and Hitachi lasts nearly forever.
I have found the same, I have drives (IBM/Hitachi) which ran in a museum for >10 years 24/7 (yes, desktop) which I replaced because I got scared - how could they live so long? I have had ES2 last a few months on very light loads. I move a LOT of seagates into the film industry as consumables and find them pretty unreliable.
My guess is an accountant came up with the idea that if seagate's drives fail more often with a shorter warrantee they make more profit! Very clever I must say but I have no trust in seagate. Their support is also shocking whereas I find Hitachi's second to none. This is 15 years of findings summarised, but as it is not a formal press release and just someone's real world findings it will gather no credence.