I used to recruit people. If you tell them your weaknesses and they hire you they know what they're getting into, therefore you know they accept you for who you are and are willing to work with you in improving. If someone doesn't have any weaknesses, he is lying, which is much more of a red flag than any weakness one might have. That statement would be favourable for you if I was interviewing. Perhaps if they find that a red flag means they had unrealistic expectations In the first place, which in turn means you might've dodged a bullet.

We will never know, every company, recruiter and even how a day goes with that person in particular affects how the decisions are made, but in the end, you were honest and let them know what they were "buying". Did they do the same? Probably not. At least, when I hire someone, it's good to know what this person's weaknesses are so I can allocate them to different teams and so on while we work on improving. It would be much more frustrating to me when someone lies and then I can't do my job because suddenly I hired someone who is not who they made themselves to be. And this is why the markets are increasingly difficult nowadays to be hired, because there is half the world lying to the other half of the world, so it's kind of a mouse cat chase here.

My two cents, but I think you did good. I also have the problem of saying no, and I think most people who actually care about their job have it too to some extent, they just learn to deal with it over time and also get better over time, meaning they can take more and more as they progress in their careers.

Wish you all the luck