Because the regulators weren’t stupid. They knew an overnight ban would ground flights (impacting jobs, economy in remote areas etc) so they gave the industry some leeway.

I can only assume that current regulators don’t have an incentive to wait when it comes to this problem. Perhaps they think not too many job are impacted, and no remote village will go without their mail service, etc?

Personally I don’t have a problem with some middle-and-upper class cyclists having to use regular Gore-Tex for their leisure activities so my kids don’t get poisoned. They’re not coming to take away your existing jacket, just continue biking like you’re used to…