If not for botting (that's hard to actually prove), why not ban them for bug exploit or hack? They're doing impossible things for players who's legally playing.
For me, the solution is launching some solution that makes sure that no process will mess with FFXIV's packets and makes sure that the client has the exact checksum of a non modified client.
But... But... Muh parser... Sorry, guy. Using parser was illegal to begin with.