Combo skipping is like the current jump exploit, it's just a question of training. Any average player gets it in 15 minuts on a strawman. You don't need to think of an extra thing. It's constantly the same. It's a win/win mechanic that is valid for every single time you'll launch your combo.
Current system demands more adaptability. Depending on the situation you'll cancel your combo to dodge an attack losing a bit of dps, or you'll finish it if you don't need to move and thus do mare dps. Depending on the situation you'll also be chosing a high rank combo or a low rank combo to fit the purpouse, fast relatively small dps or long relatively high dps.