One key aspect you skipped over is it's self-reversible. 'A' becomes 'N', and applying it again 'N' becomes 'A'. "rot13 is reversible" -> "ebg13 vf erirefvoyr"

One key aspect you skipped over is it's self-reversible. 'A' becomes 'N', and applying it again 'N' becomes 'A'. "rot13 is reversible" -> "ebg13 vf erirefvoyr" -> "rot13 is reversible". "rot8000 is also reversible" -> "类籸籽籁簹簹簹 籲籼 籪籵籼籸 类籮籿籮类籼籲籫籵籮" -> "rot8000 is also reversible" Rot13 is English-alphabet only so it skips numbers, while rot8000 doesn't have this limitation because it uses the larger unicode set.