The suggestion is to redefine an OP_SuccessX opcode, eliminating the need for _Verify behavior and allowing for either OP_Expire or OP_CheckExpiryTime as better names for the opcode. The sender also acknowledges proposing an explicit field but realizes that the taproot annex makes it unnecessary. Additionally, having an nExpiryHeight could be beneficial in cases where a signature covering the field is sufficient.

Please note that the farewell part of the email has been excluded from this summary.