Use-case workshops usually start from the technology. People are asked what could be automated, summarized or generated, and the answers reflect what the tools happen to do well today. The result is a catalogue of interesting experiments with no shared logic for which ones matter.
Interesting and valuable are not the same thing. A use case can work beautifully in a demo, save a real person real minutes, and still leave the surrounding journey exactly as slow, inconsistent or frustrating as before. The improvement is absorbed by the next handoff, the next approval, the next wait.
Making one task faster is not the same as improving a journey, and improving a journey is not automatically the same as creating business value. Each of those is a separate step, and discovery work that skips them ends up prioritizing by enthusiasm rather than by outcome.