I've seen that many (if not all of them) MEMS, like accelerometers, they are only available in QFN packages.
Why is that?
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Simply because: what else would you want to use?
It is not true that they are only in QFN enclosures. Look, for example, to the Farnell website and see how many types of package there are: https://pl.farnell.com/c/polprzewodniki-uklady-scalone/czujnikowe-uklady-scalone/moduly-mems