Index fragmentation and SSD disks
Using solid-state drives certainly does reduce the performance impact of fragmentation, primarily because random I/O is so much faster than traditional storage.

Nevertheless, the reduction in page density (and extra logging) caused by page splitting is still undesirable and may still impact performance.

Generally speaking, well-maintained indexes with an appropriate FILLFACTOR are good regardless of physical storage considerations.

See Paul Randal's excellent article on TechNet for details.