Oh my dear, Drake.... it's really troubling that you genuinely have been spewing this for months in various discords and many in-game FL matches. You're actually famous across all NA DCs for being so deranged. Why is it so hard for you to comprehend that some players have better ping, are more familiar with their skills, have better map awareness, and have learned to play preemptively. If I see a DRK running towards my group I immediately break away or counterattack if I'm on RPR/MNK, if I see a NIN running towards me and I'm near 50% I obviously know he wants to LB so I spam recups, if I see a DNC running in I burst them down in the hopes of killing them during their LB animation...do all these scenarios mean I have a program telling me when to press a button? No. It's basic pvp sense that you naturally develop after playing the game for a bit.
Also you're example of a DRK LB'ing when being NIN LB'd....there's a milisecond delay before NIN's LB engages, that gives a player enough time to press their DRK LB if it's up. It's not cheating, I can do it and I'm on console, there's literally no way I can install 3rd party add-ons on my game.
Time to wake up Drake and realize there's just TONS of players that are above your skill level. And this is coming from a solo player, I don't play with a team and I rainbow all jobs.