No, I take the least number and weight of bags and racks that suit the gear I pick. The gear choices come first. Then the bags.

I started out with 4 panniers in 2007 when I did the Trans America with 45-ish pounds. As I trimmed the gear list I have used a lot of different setups. When I was at 22 pounds of base gear (including bags) I used two small front panniers and just a tent on the back. At 14 pounds base gear weight (again including bags) I did the ST and used a light rear rack with two very light silnylon dry bags tied on and a handlebar bag. I have also gone with a small dry bag, a bar roll, and a small backpack each with 3-4 pounds or so in each of them. I think my lightest packing list was about 9 pounds, but I usually take a some extras so have never actually gone with less than 10 pounds.