If 'walking' and 'running' resist reduction because they differ in manner, this distinction is itself capturable by adding primitive MANNER features, not by abandoning decomposition entirely.

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manner(as used in philosophy of language): The *how* or *way* something is done—for example, running and walking are both ways of moving, but they differ in manner (one is faster, one is slower).
primitive features(as used in philosophy of language and semantics): Basic, fundamental building blocks that can't be broken down any further—like treating 'speed' or 'effort' as a basic element you don't need to explain in simpler terms.
reduction/decomposition(as used in philosophy of language and semantics): Breaking something complex into smaller, simpler parts to understand how it works—like explaining a car engine by describing its individual components.
resist reduction(as used in philosophy of language and semantics): When something can't be fully explained just by breaking it into smaller pieces; there's something extra left over that the simple parts don't capture.

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