Well, but for sufficiently small things one may be able to get by without too toxic cryopreservants? Famously, things like embryos and even rabbit kidneys have been frozen and then "revived". If this could be scaled up to e.g. a mouse (something which is big enough to have nontrivial memories), that would resolve lots of worries about there not being enough information preserved in a vitrified brain.
You can freeze nematodes and water bears fairly easily. Notably both of these are evolved to survive dessication and freezing in their normal life cycle and have their largest dimension on the order of one mm. Its a bit of a stretch to call what some frogs can do naturally in the outdoors 'freezing' but again, massive evolutionary pressure.
If you try to freeze a complicated structure bigger than a few cubic centimeters that isn't the ridiculously vascularized and quite small and very homogenous in terms of water content rabbit kidney, you come up with so...
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