Too much fuss about nothing. Samsung just want to be sure that they aren't getting ripped off on warranty repairs and that they have an accurate idea of the devices repair history. Especially with 4 - 7 years OS support on new models, that phone will likely belong to several owners over the years.
When I worked in Telecoms back in 2005 - 2008, Samsung had the very best repair centres. Out of all the OEM's their repairs were the fastest and the best quality and if a phone went in for repair more than twice, they would replace it on the third repair with a brand new unit.
Could not say that about Nokia, HTC, Sony Ericsson or Motorola. (There was no iPhone yet in my country at that time)