There should be a way, perhaps with the industry features in citadels, to combine old T2 crystals into new, full ones that can be repackaged and stacked.
Old crystals pile up, causes minor bugs when trying to reuse during loading and reloading, take up huge amounts of space in item hangars, and just cause an unnecessary loss. It’s often less of a hassle to just trash all your old, partially used crystals and buy new ones rather than try to reuse them. That sucks.