dead money kills us again

By what metric do you say it's working? We do not have a winning, or even .500, record, don't have a franchise QB, or a #1 pick next year. KC has Mahomes and their cap situation is better.
https://www.spotrac.com/nfl/cap/
Mahomes cap hit extends out to 2031 at $40-50M/yr isnt that the same not yet fully realised problem you are admonishing the Saints for?