Incremental transfer improves on unicode-range by avoiding damage to layout (kerning, ligatures, etc) rules, meaning it can efficiently support fine grained increments to Latin and to complex, shaping scripts like Indic or Arabic.
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We also have an explainer, which is shorter and easier to read than the actual specification:
Garret Rieger, co-chair of the @W3C Web Fonts working group, created a demo so you can see IFT in action. It uses an implementation in Rust, transpiled to wasm:
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