I'll agree it isn't really cheating since it is a gameplay design but it most certainly is an exploit. No class in this game can become a 'pseudo-bot' to such a degree with /follow, that I'm sure it's balancing a fine line in breaching the ToS in regards to automated play. I'd genuinely be curious what a GM's stance is on this because while I doubt you'd get in trouble for utilizing this since no third-party program is used, I also doubt they would punish somebody for booting a SCH who afk followed an instance. If anything SE will probably ignore the issue until it becomes more widespread an toxic and are forced to butcher Eos/Selenes' heals when level synched.
