You have a gazillion partitions. Half of them are not a formatted filesystems. They only hold one file. Most of those are ELF files, like xbl, abl, cmnlib, modem... Many are even empty, all zeroes. misc is just raw unstructured flash memory.
There are only four logical partitions, system, system_ext, product, vendor. They are in the physical partition super which is not a "real" filesystem like ext4.
cache is a tmpfs, it's only using RAM for storage which is why the contents disappear when you reboot.
Since "splash" is not used, I used it recently to debug a custom recovery by just writing text to it like one big file. Unlike cache, after crashing and reset the contents are still there.
You didn't mention the blue light before. Are you sure that it is supposed to be on when it's happy?
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