This is more on Warren than the politicians, imo.
He never met with the state before last week's live proposal. We know that because JB said his team never met with Bears officials, and even during the presentation during the Q&A session when Warren was asked about his thoughts on JB "throwing cold water on the plan", Warren responded with, "How could he throw cold water on it if we just shared what the plan is?" Basically saying that JB and the state never saw the proposal.
Warren was also asked if the Bears were ready to spend months to years enduring legal battles from environmental groups, (i.e., Friends of the Parks), and he said that they will have those conversations.
If the Bears were hoping to get approval by this May, why the fuck would you not have conversations with those who could block you from proceeding? Warren's plan seems to have been to gain public support by wowing them with pretty pictures, and having Chicago/Illinois residents pressure their politicians into approving the plan. That seems to have backfired pretty badly. Residents don't want to help pay for a new stadium, and they seem annoyed that it was painted like it won't be that much for taxpayers.
I'm not a fan of politicians, but I think JB is getting this right. There are more important things to pay for than a new stadium for the Bears and Sox.