Why does Ali have different ballroom shoes? The other females have thinner heels on their ballroom shoes, Ali's heels are chunky.
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. What you seem to be describing is a cuban heel, often worn by children and beginners until they can build up to the slimmer heel. The tan shoes worn on Strictly, and by many dancers are worn more commonly because the tan colour is supposed to make the lines appear more extended. Twenty years ago or so most female dancers would have worn silver or gold shoes but fashions change - this can also be seen in Ice Dance, where fewer ladies wear white boots and men wear black as they now favour tan boots for the same reason of giving longer lines. There is a good chance Ali was recommended to wear the shoes she had did by a physio/doctor or more experienced dancer, I doubt she was trying to draw our attention away from the dancing or to make herself stand out in any way.
). As Bella Guerriera says, they are often worn by less experienced dancers. This is because they help balance.