Keyword search, if it goes poorly, just feels like I need to work harder to find the right keyword, not an actual failure of the system. Whereas when semantic

Keyword search, if it goes poorly, just feels like I need to work harder to find the right keyword, not an actual failure of the system. Whereas when semantic search goes bad, it is infuriating and entirely the fault of the computer (especially when I've given it the precise word I need it to look for and the computer "thinks" it "knows better") ...or at least that's how the medium-to-savvy users will tend to feel about it. In making your decisions you need to think not just about what users think/say they want, but also how they'll react to the system's failure modes.