Yes, I know it's an important combo, but you also have the frontal combo, so it's not like you just lose all sources of damage when you whiff. Also, you can salvage some of it with Feint > Disembowel.

And not all DRG WS have low accuracy, it's only Impulse Drive, though I have to admit that WS would struggle to strike the wide side of a barn. Still, it seems counterintuitive to sacrifice so much just to make one of your combos reliable. It could very well be that it's the best way, but since DRG is pretty bad for most things, I only really played it at Ifrit and there I didn't find much use for the CT combo as it has super long animation locks and you can just as well dart in and out for the DS combo the few times it's actually safe to combo at all.