What my assumption was, and what feels implied by the terminology is this:
- Supporter: "I'm familiar with, love, and want to participate in this verse. Please contact me if there's a discussion about it."
- Neutral: "I'm familiar with this verse, without strong opinions, and am willing to participate in discussions if nobody else will."
- Opponent: "I'm familiar with this verse, but hate it and do not want to participate in it. Do not contact me for discussions about it."
While technically anybody could list themselves, it feels unlikely that someone would bother unless they were at least somewhat familiar with the verse, or had regular experience with being asked about it.
From this perspective, I think it serves as a helpful optional tool to easily let an entire verse know what your stance is on participating in discussions, which helps people know which members to contact first when seeking input, or perhaps more useful, which members absolutely not to contact.
It is ultimately not very impactful, so I see no reason to make a fuss about removing it.
If nothing else, I think it makes people feel very connected with the community to have their name somewhere on their favorite/hated verse page.