Why doesn't Darius Q have a sweet spot hit indicator?

Watching some Ambessa gameplay, i noticed that a cosmetic crit indicator is displayed on her Qs, when hitting the outer edge sweet spot, similarly to Aatrox Q.

I wanted to know more about it and sure enough, the lol wiki provides a handy list of every ability that can trigger such indicator: Successful ability casts.
I scrolled trough the list, and then it hit me...

Darius does not have a cosmetic crit indicator on Q!

It is one of the most iconic sweet spot abilities in the game, why does it deserve such a treatment?

It may be because the Q ability description reads as such:

[...] dealing physical damage to nearby enemies, reduced to 35% against enemies hit by the inner radius.

whereas, in Ambessa's case,

The damage is doubled against enemies hit by the outer edge.

Am i reading this correctly?: The cosmetic indicator is used only in case of a conditional damage increase, but Darius Q edge is just the "normal" Q damage, and it can only decrease - in the inner circle?

Basically, Darius Q not only does not have a sweet spot indicator, it does not have a sweet spot at all.. It just has a sad, sour spot :(

Is that it? No low-cooldown dopamine for Darius?