I would disagree that it's a baseless claim to make, when a claim of it making a mechanical impact was part of the original post.
It's making an argument that the system has at some point caused either his or someone's Diona character to die instead of healing off of the brighter normal lights. This is further implied with the comment of it being "Nice from an RP perspective but for an overall game experience it is preferable to be disabled." as this is more or less acknowledging that the RP side of things is not the argument being made, but the mechanical impacts it has.
Affected has commented on the performance side of things, which is that it doesn't really impact much if anything other then the initial swap of lightning modes, their other argument is not about how it is from an RP stand point, which leaves only the mechanical argument left to be of any concern, so, I disagree that it's a ludicrous take to have on the argument so far. A bit assumptive that he plays a Diona, sure, but still not -that- ludicrous of a take.
And the mechanical argument itself can be unraveled by the counterpoint of just using the PDA you spawn with, using the PDA light is enough light a Diona suffers no problems. The effort of removing the system seems unwarranted, it still does add -some- RP value as you and the OP have stated, and the actual negative impacts are incredibly slim.