kurup
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You don't NEED a solid booster, that's true. But in many cases it's 'optimal'. less moving parts, it's simpler and therefore lesser prone to failure.
'Strap On' boosters for instance- you need something that's a small size, solids can give that compactness much better than liquids in many cases.
True . Your point stands .
But majority of rockets with manned missions use a liquid booster . One has to wonder why ??