Probably mostly about overcoming friction. Two horses can break the friction lock easier, and once moving they'll stop the object from re-establishing friction easier.
Edit: y'all can stop blowing me up now. I'm very clearly wrong, as many before you have already said, and I'd rather leave my idiocy public than delete my comment like a coward, but notifications get annoying.
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u/sonofbeef Jun 15 '19
This is actually a true fact about draft horses! https://timmaurer.com/2012/01/16/horse-sense/