Yeah it is pretty nuts: https://www.epi.org/publication/shortchanged-weak-anti-retaliation-provisions-in-the-national-labor-relations-act-cost-workers-billions/

Though on the plus side the current Dem controlled Board is trying to find ways to stretch their authority to improve things: https://nortonrosefulbright.com/en-us/knowledge/publications/e03ca5f7/nlrb-revises-back-pay-formula