There is a big difference in putting together deadly artifacts and electronic devices you can fabricate using off-the-shelf chips and open protocols. Not saying you can't discuss regulating them, but to me they are in a different set of categories. Weapons are by default dangerous, their sole purpose being to cause physical harm, while a flipper zero can be used for instructional purposes and research.
As much as I hate the concept, it would be ridiculous for me to propose regulating Alexa because a kid can cause financial harm to the parents using it, but a weapon can't be in any imaginable circumstance reachable by anyone untrained.