Index fragementation ? is it unavoidable
That may work for your clustered indexes, but you'll also have nonclustered indexes to contend with. They can suffer a lot too, and that's often where it can matter the most.

But you should consider the impact. There are times when fragmentation can be a big thing (such as when you delete data from heaps a lot), and times when it's really not such a huge problem. There are typically other matters that are more important to tune than trying desperately to avoid fragmentation.