You are either refusing to read what I wrote or insisting that there is a case where it is optimal to use a skill of 140-180 potency (an unprepped and therefore DoT-less Chaotic Spring) over literally any common action that would supply 300+ ppgcd more.
Chaotic Spring without a combo does not apply its DoT. It's just the 140-180 potency, less than even a Piercing Talon or True Thrust.
For it to apply its DoT, as you'd want before a boss jumps away, you would have to reset your combo 2 GCDs earlier. Until that Chaotic Spring is prepped, there is zero value in hitting that skill.
That would be like saying one should use a weakened, combo-breaking Piercing Talon from melee range. No. The CT/CS you use off-rhythm before downtime is nonetheless prepped. As such, it requires having reset your combos prior to use.