The concept of putting the compass on the side of the lighter is flawed. Even a piezo lighter has a steel spring and the compass needle has a strong tendency to align with it. Itīs possible to make springs from nonmagnetic material, but they are inferior.
It might work if the spring is aligned with axis of the compass needle. However thatīs bound to bloat the lighter.
Maybe most of the customers donīt care if the compass on the lighter actually works. So the manufacturers can get away with a product that doesnīt work.
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If it isnīt broken, it doesnīt have enough features yet.