I believe that Sense will be reluctant to add RJ45 as hardware changes are costly. It’s also possible that the circuit boards inside Sense are off-the-shelf from a third party and will not support it. Software changes are easy; hardware changes, are, well, “hard”. Another obstacle might be the introduction of “signal wiring” (the ethernet cable) into the panel. Electricians and code experts are welcome to chime in; I suspect that there would be code issues with this.
It’s getting into a major redesign but Sense could change the form factor of the device to an outside of the panel default. The device could have a flexible conduit leading from it that would enter the panel through a standard 1/2" knockout (much the way the antenna leaves the panel now) and present connectors for the CT’s and the power cable inside the panel. With that done you’d have liberty to mount Sense anywhere within the length of the attached flexible conduit from the panel to optimize Wi-Fi. Sense could then have an RJ45 connector without any issues of running ethernet cable inside a panel.