Capes and Tails.

[MellowMink]

I don’t wear any capes where my Hrothgar tail clips through unnaturally; it’s super distracting and weird, so I would really like more cape options that hide or otherwise push down my tail.

[Canadane]

While a Cape toggle would be one thing, it's not entirely unique to capes where the tails look bad. Tails clipping through longer coats, and certain robes also look rather lazily designed. Because of that, I think a tail toggle would make more sense, since with it they don't have to go around and design armors with tailed races in mind, or make a second unique model of armors for them...

Many coats have slight adjustments for tailed races, where there's a tie-off for the hole or such there.
While doesn't stop clipping in general, at least it's something they've taken notice of.

Considering they have multiple races with a tail they shouldn't have a "tail toggle", they should just do their job and properly model outfits.

[SturmChurro]

Considering they have multiple races with a tail they shouldn't have a "tail toggle", they should just do their job and properly model outfits.

[TheMightyMollusk]

Considering they have multiple races with a tail they shouldn't have a "tail toggle", they should just do their job and properly model outfits.

I mean, we can say that about races with non-standard ear placement too, but Miqo'te, Elezen, and Lalafell ears have been getting ignored for a while now, not to mention Viera and Hrothgar, so at this point the simplest answer is all we can really try to expect.

[Arzalis]

Many coats have slight adjustments for tailed races, where there's a tie-off for the hole or such there.
While doesn't stop clipping in general, at least it's something they've taken notice of.

Considering they have multiple races with a tail they shouldn't have a "tail toggle", they should just do their job and properly model outfits.

Those armors were made before ShB. After ShB they stopped giving those races any special considerations for whatever reason.

[Iscah]

Multiple dye channels really isn't more graphically intensive than a single one

I don't think the issue is graphical intensity but the amount of data attached to the character. If every gear piece has a second dye channel then the server needs to be telling you that extra piece of information for every item worn by every character nearby.

If the reason we can't get any more character customisation settings is because of the amount of data it would need to transmit, then we wouldn't get additional dye channels for the same reason.