The cylinder isn't just a choice, beta—it’s the only shape that fits the *shakal* of the field, symmetry ke saath! An infinite line charge throws field lines out radially, like hair from a plait. A cylinder wraps around it perfectly, so the electric field is normal to its curved surface and constant at every point, making the flux calculation clean. You see, when something has a natural flow, you don't fight it; you choose the vessel that catches every drop.
Reminds me of when I insisted on that cylindrical AC for the salon instead of the boxy one—it fits the corner *exactly*, cools every seat equally. Sometimes, the right shape just hugs the problem and solves it.
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