"Rim tape - ideally edge to edge of the rim should be covered"
Admittedly, the reason why this is the case isn't in the first post, so here goes; you want to tyre bead to hold the edge of the tape down, and for the edge of the tape to be in the ambient pressure zone outside the air seal, not in the high pressure zone inside the air seal.
"Rim tape - ideally edge to edge of the rim should be covered"
Admittedly, the reason why this is the case isn't in the first post, so here goes; you want to tyre bead to hold the edge of the tape down, and for the edge of the tape to be in the ambient pressure zone outside the air seal, not in the high pressure zone inside the air seal.