A thing I have never had the time to look more closely into. But I find both variants: What I love most is ... or What I love the most is ... I think the more common form is 'the most', and I ...
During most of history, humans were too busy to think about thought. Why is "most of history" correct in the above sentence? I could understand the difference between "Most of the people" and "Most
Compare to: "What bed do you spend most of the time (sleeping) in?" or "What shoes do you wear most of the time?" These are questions that most people could answer. Another way to look at it: "What TV show do you spend most of the time watching?" is a loaded question. It already implies that I spend most of my time watching TV.