There are several reasons why you should try and keep on the grid: the main one is that it makes it a lot easier to edit your geometry later down the line (this is also why you should try to stick to larger grid sizes when possible). Your map will also compile slower if you have lots of off-grid geometry, and you might get leaks, or errors with the compiler such as faces not drawing. QBSP is old, so treat it kindly.
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