Authentication / User Experience
Kind: tension
Record: tension:authentication-user-experience
Canonical: Schema
"authentication" (security-core layer) is traded against "UX" (performance-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "UX" and choosing an explicit operating point.
Listed in Tensions, after Threat Modeling / Delivery Speed and before Authorization / Policy Complexity.