Not just the name, but the way that this system is presented. It puts "veteran writers" on a pedastel and, since they can only be "senpais" and can't double up as a "kouhai" to someone else, it implies that they already know everything and stops learning from flowing both ways.
I'm also highly sceptical about people here "guiding" others in the first place. My English lecturers at university would always refuse to answer the question "How do you write an essay?" because it's impossible to tell someone else how to write one - there are just too many ways that are all valid. Instead, they could only tell us what they thought we'd done wrong after we'd written one and have us learn from that.
Now, those were academic essays that had a rough field standard; the big wide world of creative writing is even more individualistic. You can give your personal feedback on a story, but you can't tell someone how to write. Does everyone who's going to sign up to be a "senpai" properly understand that?
My concern is basically that this could force an artificial split between older and newer writers on the forum, do more harm than good to new writers, and be nothing more than an undeserved ego trip for so-called "veterans".
If you want to help people out with GL or need help with writing GL, there's the Yuri Writing Help Room here:
https://forum.scribblehub.com/threads/the-yuri-writing-help-room-18.754/
We're always in need of more experienced ladies to share their opinions and advice~!