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A full, raw EDL backup (with a combined size the same as your flash, 32GB or 128 GB) will always go back on your device just fine. If you flash it on your friend's device you have just overwritten the device ID, WiFi and Bluetooth MACs and who knows what else.
Do not ever "wipe" your data. That destroys your keys and even a raw backup will not save you.
Although the (freely available) documentation is poor, I presume that additional efuses on your device could be blown. If the OEM were to release some evil update they could blow fuses and clamp down on a lot of things. That would be evil.
The anti-rollback would not necessarily be a big deal, but it might require some effort. We've seen that we can flash the "wrong" software on a device (e.g. flash Poke5P on a Poke5). The normal update process checks the metadata and signing on the update.zip, but I update without that anyway.
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