The gap between the two testing rounds ended up being the most useful data point in the whole project.
It wasn't just that the hi-fi prototype looked more finished testers moved through it in a third of the
time it took to get through the same tasks on paper, and rated it 9+ out of 10 on both experience and
intuitiveness.
Some of that gap was fidelity: color, real photography, and a tactile phone screen are simply easier to
navigate than pencil on an index card. But a real part of it was the design itself catching up to what
round-one testers were struggling with especially the block-and-report flow, which went from the slowest,
most confusing task to one of the fastest.
The lesson I'm carrying forward: test the safety-critical flows first. Reporting and blocking aren't a
feature users browse casually they're the flow someone reaches for at their most uncomfortable moment,
and that's exactly where clarity matters most.