I there is an indication of intent to use different dividers, we would keep them.
For instance, Japanese releases are specific about the characters used (often very stylized), and we don’t usually standardize them.
But very often a release has a colon on the disc, a hyphen on the spine, and so on… then we apply the ‘standard’. And if course when there’s just a picture w. no divider.
We often go a step further and assume that 99% of artists don’t have any care about dividers used, and replace printed ones too. I’ve noticed it change a bit with digital releases, where I’m seeing the store-used divider retained much more - presumably because that name becomes canonical/what people search for/want to use, for that release.
I’ve always wanted a subtitle field