A little different take:
A pipe changes forever. If it sits in a shop, all lonely and unloved, it is getting older. A pipe you smoke will likely change most dramatically after the first few to couple dozen times. After a while the changes are so slow and subtle that you can't possibly notice.
like others here, some seem perfect from day one and some take 100's of smokes, and some never seem to get "there".
But, in any case, like you, they are always changing at least a little bit. For me, this is an especially important feature of our hobby!