I mean guide on steemit which use 3B. Although yours could use update as well. For example, you may want to emphasize that Sparrow Server have no build for 32-bit ARM, which means your guide wouldn't work on 32-bit OS and very old version of Raspberry Pi.
Yes, I probably will do it as soon as possible, thanks for the suggestion.
There is a security aspect as well when using a linux machine without doing proper user management, but I don't have the necessary knowledge (and time) to cover it.
So if you spot this as a possible issue, it's known, but kind of ignored.