Here is my own entry.
The third party firmware market is a driving force for innovation and product functionality. A lot of (perfectly legal and harmless) product features first started in a third party firmware product, and was eventually integrated into manufacturer's official firmware.
While some of these projects can indeed provide functionalities that allow for circumventing channel and power output limitations, that does not mean that the entire third party firmware market is doing so.
It is my belief, both as a long-time user and a third party firmware developer myself that forcing manufacturers to flat out prevent the flashing of a third party firmware will be harmful to the market, and deny end users of choice (for cases where an original manufacturer's firmware would be devoid of advanced features and/or contain unfixed security holes and/or has software defects and/or are no longer being supported by the original manufacturer.
Therefore, I recommend that the scope of these rules be reduced to only ensuring that the radio components are operating within the legal parameters, possibly by shifting the solution to a hardware limitation, rather than a software limitation.