Given the cells significantly expand and contract, and EVE tests cell failure with a rigid fixture, it seems crazy to me that folks are using completely rigid fixtures. To each their own I guess.
EVE recommends compression for maximum longevity, and they basically give us the pressure guidelines. If the user chooses to use compression, it's illogical to use anything other than some form of fairly constant rate of compression (within their guidelines) across the SoC range (basically using springs, foam, or some other media which achieves this). Seems pretty simple, yet there's still ongoing discussion about using rigid compression... I'm not sure why this is even remotely considered a good, or even safe, practice.