At what team size do you think 360° performance reviews start making sense?

Most enterprise review tools are built for 500+ person orgs. But we've seen 8-person startups struggle with the same feedback blind spots as Fortune 500s.

Performs360 scales from 5 to 5,000 team members — same features, same encryption, same price (free).

When did your team start doing structured performance reviews? What triggered it?