Currently, MNK still gets the buff/debuff/"combo" for all directional attacks (Bootshine, True Strike, Twin Snakes, Dragon Kick, Snap Punch, Demolish) even when done from the incorrect position. This means that even if they are unable to reach the desired position (flank/rear) in time, or at all in the case of rear attacks on Demon Wall, they still get their "combo" at reduced potency.
When DRG uses Heavy Thrust or Impulse Drive from the wrong side, that's it. Nothing happens. You get the nerfed potency from doing it wrong, don't get the buff from Heavy Thrust, and Impulse Drive's combo doesn't start. Since Impulse Drive leads to Disembowel, this means that any content where an enemy's rear is unavailable is hurting DRG's potential DPS in a very major way. Which isn't to say MNK doesn't suffer at all, but again MNK's issues don't impair their "combo" flow.
I'm proposing that DRG's directional requirements be made optional as they are for MNK. I mostly bring this up out of concern for the upcoming Leviathan primal fight, which initially looks to be such that his rear is not exposed to players.
Edit: For extra emphasis/clarity: