I'm a big guy, and do a lot of descending, I'll keep my discs. In fact, I take my gravel bike (with road tires) when I know I'm going to do a lot of steep/long descents. I'll take the 5lb weight penalty when climbing to have the assurance of discs on the other side (my next road bike will absolutely have discs). I've done descents around here that were scary even with discs, and there were smaller guys on rim brakes with carbon wheels that had no issues, do whatever works for you.
