Earlier quoted context omitted.
Yup, another father here: I'd love an always-on camera that I can tell to save the last 30 seconds of playback. There are a lot of moments I'd love to have on video or camera that are there-and-gone - even if I had my phone in my pocket, by the time I pulled it out, it would be too late.
GoPros (and other action cameras, I assume) have a feature like that. But please don't be "that guy" constantly recording unwilling subjects (except in your own home, of course)
Not even.