desirable feature
Used in computing contexts to refer to a feature that makes software, hardware, or a system more attractive or useful.
One of the desirable features of this app is that it can be used offline.
機能 is a general term for 'function' or 'feature', while 魅力的機能 specifically emphasizes that the feature is attractive or desirable.
Compound of 魅力的 (attractive, charming) and 機能 (function, feature). The exact origin is uncertain, but it is a straightforward modern technical term.