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It is not a user opt-in — execute.ts arms it automatically on the CLI render path, so ~11% of installs already route without anyone choosing it. The opt-in is at the CALL SITE: the flag defaults off and only the two CLI sites set it, excluding programmatic renderLocal consumers because the mechanism mutates process.env. That polarity guards embedding contexts, not users. Calling it opt-in understates today's exposure, which changes how a reviewer judges the ramp: it is not protecting users from a feature they chose, it is governing exposure already happening without their choice. Leaves the accurate uses alone — 'explicit user opt-in' means someone setting HF_DE_PARALLEL_ROUTER themselves, and the call-site flag is genuinely opt-in. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>