Fun fact, I ran into this question early on while developing HATETRIS. From least to most convenient, the pieces in HATETRIS are S, Z, O, I, L, J, Thttps://twitter.com/mplblm/status/1096693863148867585 …
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Public perception of the usefulness of the I piece in clearing lines is warped by the points bonus for using it to clear four lines at once (i.e. get a Tetris). Laid horizontally on a bumpy stack, it creates gaps. Placed vertically, it dangerously increases the stack height
It's true, the I piece is very useful if you habitually build dangerously tall stacks with single narrow slots specifically for I pieces to go into
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