I can't advocate, as I am neither a DM or DD.
I recently took on maintainership of sosreport package, and without the through triaging and help from Phil, I don't think I would have got to the point where I am. Now, the work I am doing, I already have a one-to-one relationship with a DD who is helping with my sponsorships moving forward.
All the feedback, not only has helped me with the Debian work, but as well as the sponsorships for stable releaases I am doing on Ubuntu as well.
Phils maticalus tirage report and discussions on debian-mentors, the comments on the uploads as well as IRC have always been great, and have given great learning opportunities, without this, I think it would have been harder to get into Debian imho.
Phil is a credit to the team, and if I could give a +1, I would