To be fair G, We appreciate your assistance in reply and helping of W360, but in that light, it does help yourself to remember that taking on that role means that your responses directly reflect the image of the 'FormD' brand now, whether responsible for design changes or not.
In this case, the options for the response should have been, as said by others "thanks for the feedback, it may be looked into, however, no new revisions are planned in the foreseeable future but do not rule it out" (or something similar) or simply, no reply. Both better than a mini lecture.
Once again, we appreciate the effort and time you put in here, so please take it as constructive feedback and nothing more.