It was added after 19.1 was released.I never did this, and its also the first time that I read about this.
For my part I upgraded from 18.1 and never flashed this. Everything, also OTA updates are working for me without any issues.
I suspect the vendor_boot is part of the LOS19.1 rom/zip but also a hard dependency for the 19.1 recovery to boot. So the chicken or the egg problem. For upgrading we are using a 18.1 recovery so that's why we probably don't need it. I am gonna check the payload.bin of the latest LOS19.1 and see if the vendor_boot is in there.
Update: I checked the payload.bin and my suspicions were correct, it has the vendor_boot in it. It has the same hash as the downloadable vendor_boot from the wiki.
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