ASICs abstract away the complexity
Your spinning rust drive isn't actually organized in the cylinders, heads and sectors presented by its controller. That's an abstraction. Sectors go bad on spinning HDD's too, and are dynamically remapped. The ASICs on the logic board remap the physical storage to logical storage in order to retain compatibility with some rather archaic drive technologies and improve MTBF.
The abstraction allows for certain other new features too, like on-drive encryption and hybrid drives with Flash cache for performance.
So too SSDs use application specific integrated circuits to basically lie about the underlying physical storage. In SAS and SATA form factors they also report "Cylinders" and "Heads" - neither of which they have. Successive writes to the same sector are actually written to different physical cells for wear levelling and performance. The operating system should not care. What the operating system cares about is that the data written is the same as the data returned when it's requested. And that's all. We don't care if the drive lies - just whether or not its lies are consistent.
Most of the G3 SSD technologies have sufficient reliability for datacenter use for five years or more. The price needs to start coming down now. It probably would have come down quite a bit more than it has if people weren't buying so many personal devices that utilize Flash chips.
The slow uptake of SSD in the datacenter has nothing to do with reliability issues, and certainly not performance. It has to do with the fact that the major server OEMs make billions a year selling racks of spinning disks too. HP last week finally came out with 800GB Enterprise SAS SSD drives for their servers. What they want for them is incredible, but at least they're finally available. This is the local disk that provides the IO requirements and capacity requirements of your modern server consolidation needs. But the pricing? That looks like it's about delaying the wholesale migration away from FC SAN for as long as possible.