Overall Equipment Effectiveness isn't one number — it's three independent loss factors multiplied together.
A machine can run 100% of its scheduled time — perfect Availability — and still post a terrible OEE if it runs slow (poor Performance) or turns out defective parts (poor Quality). That's not a contradiction; it's exactly what OEE is designed to reveal. OEE = Availability × Performance × Quality, and because the three factors are multiplied rather than averaged, a genuine weakness in any single one of them drags the whole number down no matter how excellent the other two are. Collapsing OEE straight to one blended percentage — without also reporting the three factors that produced it — throws away the exact information a maintenance or production team needs to know what to actually go fix.