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Dibble
I believe the idea is to cut through the mud and hit something a little less soggy underneath. Chunkier tyres would get clogged pretty quickly. MX bikes come to mind.
Testing true effectiveness of 33 vs 40mm tyres is a whole other thing. Saying all that, it's all swings and round abouts.
Few years ago we were all rolling on 23c tyres and 650b was an anoraks' plaything.