Destructive testing definitely has it's place, but when you model something in FEA you have the opportunity to really control the variables involved in the whole simulation process.
For example, you could develop a 5 point test and test 5 different parameters of each rod and how the two samples respond to stresses etc etc, but your are able to do this in a fully controlled computer environment.
Now sure, simulation has it's flaws but it is massively widespread in engineering these days and is always going to be better then "My H beam rod can take 1337 more kebabs of power then your I beams bro, because they have extra tabouli"