SSD drives also have a limited number of read write cycles, folks don't talk about that much, esp mfg's.
The phenomenon to which you are referring is termed "write endurance" - and is a factor in SSD's because any single block can only be written to a certain number of times before it becomes unreliable. With the earlier, very small devices it was a significant factor in whether an SSD made sense in any particular application. However, at this point (because of the write spreading algorithms usually referred to as "wear-leveling") you'd have to write the device constantly, straight out, for 2 decades before that becomes an issue. In short, write endurance is as obsolete as worrying about biasing a vacuum tube.
The bigger issues have been that many of the first and less expensive second generation devices seemed to have a higher than anticipated rates of catastrophic failure, and issues with performance degradation that were particularly troublesome because they appeared to vary dramatically between near identical systems, and for which the manufacturers often claimed to not be able to duplicate.
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