I knew I had enabled something in the mentor dashboard to allow newcomers to find me, but Special:MentorDashboard did not have any links to "What is mentor dashboard" or "Where to give feedback" or similar. So I had to basically search for this page across different interwikis anyway. So that's a problem.
But even at the project level itself, I feel like it's badly designed.
Anecdotally, if you look at my talk page and the last three archives on enwiki, I have about 10ish editors asking me a "question" through this feature. To them the dashboard is appearing like I have sent a personalised welcome to them, but unlike Twinkle welcome messages or similar, there's no indicator at all to me (or any bystander) what is going on. It just says "Question from X", and includes whatever the users say, which is often them trying to reply to a non-existent message that nobody knows what it is.
Even once you fix that, I think the dashboard has been applied too broadly. All the users I got assigned just made 1 edit (Asking that question), often not even about editing the encyclopedia, and then never checked again. You're wasting volunteer time by directing 1-edit-accounts to experienced users, because a significant percentage of those accounts, probably even as high as 90-95%, will never check Wikipedia again. There needs to be a minimum activity threshold applied of some sort at minimum.
And lastly, I don't believe this project uses good enough metrics to track if the project itself is designed well. For example, in the August 2023 "preliminary analysis" activitation is defined at the absurdly low state of "one edit", while all the other metrics (retention/productivity/revert rate), it showed no effect at all. I think the threshold for revert rate was still extemely low and noisy, since it included everyone with just 1 edit.
All of this to say, I do not think this experience is very much designed keeping in mind the mentors who are supposed to be assisting via here. And it possibly does not even design keeping the mentees themselves in mind. If I were working on this project, I would at least revisit a lot of core assumptions made here.
As for now, I'm definitely disabling this for myself for the foreseeable future.
(I would have posted this in Talk:Growth/Mentor dashboard but that page seems to be dead.)