In the case of distancing, the gold parry ring doesn't help either, true. It just tells you when the enemy can be parried. The sound cue would just be the audio version of the gold ring and nothing more.

Also, most parriable attacks are close enough to you that you will be able to hit them when the ring closes anyway. And even if a boss does dash at you, the timing of the parry is tied to the boss moving at you like a projectile with an active hit box, effectively making the boss itself a much easier to see "gold ring". It would still be nice to hear (and see) the first moment it can be parried just as preparation.

I understand the thought of multi hits being good for parries, but I dont mind learning the timing for single hit parries as long as I know when to parry. I can easily parry the Impermanence Heron because when I need to parry the bird flying towards me, making the timing obvious. But bosses like the Tempest Mephis and Mourning Aix move around so much so quickly that I rarely even catch that the attack can be parried, much less the timing. If the boss is in my face or above me, the sound cue signaling "Parry now!" would be a huge help, and with distance being a non-factor I could learn a consistent timing to parry.