They express their willingness to set up a "black box" Lightning infrastructure on the mainnet to explore vulnerabilities and mitigations. However, they point out that the number of Lightning experts with the necessary knowledge and understanding to participate in these experiments is limited to those listed on the disclosure emails. Additionally, there were other pending non-disclosed security issues at the time, such as the "fake channel DoS vector" revealed on August 23, 2023, which prevented them from conducting the experiments.

Please note that this summary has been extracted from the email without any reference to the context or phrases introducing the information.