Can you detail that a bit more? We’ve been using htlc_maximum_msat in eclair as a control valve like you suggested a few years ago, and it seems to be working quite nicely (I’m not sure how exactly we could quantify that “it works”, but at least we’ve implemented the mechanism and haven’t seen any specific issues with it).
I don’t know if other implementations have done it, but it’s nice because it doesn’t require any protocol changes: you only need to update your implementation, and other nodes on the network will respect the htlc_maximum_msat value you dynamically set. It creates a bit of a (reasonable) channel_update spam though.