Speaking for myself, I'm pretty rubbish at evaluating and respecting my own personal boundaries.
It's not something I'm proud of. I realise it's also no one's job to do it for me. But when I look back at nearly every single incident where someone I personally knew, who was active in my circle (as opposed to like a stranger grabbing me or something) was making me uncomfortable, there has always been a nagging voice of doubt in the back of my mind suggesting that maybe this isn't as big a deal as I'm making it out to be, maybe I should just brush it off, maybe I'm being paranoid, maybe this is really my fault because I led that person on or encouraged them or tried to be their friend or don't have sufficient evidence, etc.
While a fairly pathetic aspect of my personality that I'm suitably ashamed of, I don't think I'm alone in just having been badly socialised this way.
Furthermore even in cases where it's pretty clear-cut, I would often be hesitant to come forward out of fear of potential consequences/fallback on me, for example if I thought my harasser was on good terms with staff, and that comparatively my social standing/currency didn't give me sufficient leverage, if it's my word against theirs, etc.
So honestly, anything that simplifies the process for me of having a documented, simple, coded way of putting the breaks on something is of benefit for me.
Do I deserve/need to be coddled this way? Sure, no. Is it anyone's responsibility to make sure I'm comfortable but my own? Also no. But we live in an imperfect world and if it was just me out there being affected by this, I'd likely care less, except 99% of the time when someone's bothering me this way I end up finding out that I'm not the only person they're doing this to, which makes me care 10 times more.
Anything to facilitate and make it easier for people like me to come forward serves in protecting not just their fragile sensibilities, but the general wellbeing of the game at large.
EDIT: It also means I don't have to weather the anxiety inducing process of politely reaching out to someone who makes me uncomfortable, with an excess of smileys to assure them I mean no harm, to gently indicate that while I think the best of them and know they didn't mean to, they have made me uncomfortable. Which is always fucking exhausting especially if I'm already β and I will use that word β in a "triggered" state.