One additional reason for NOT having 12v trigger. In a real environment, that 12v trigger wire may look like a 0-12V DC "wire" but to the internals of the DAC, it looks like a giant antenna helping bring external RF signals via untwisted and unshielded wires into the DAC. And even if bypassed to the case or ground, end up as ground noise and a source for potential ground loops. So it's really best to just let the case of the DAC and the shielded, twisted, and/or balanced cables feeding RF interference&noise into the DAC (some of which might show up as jitter and not just noise) be the only source of unwanted signal.
Anyways that's a purist perspective, based on theory, and proximity to actual industrial practice (e.g. FCC certification) who gave weird orders to install inductors or resistors and I dutifully complied after learning all the reasons why such orders have been given.
It's also the reason why having fancy stuff, like LCD displays, spectrum analyzers, digital level meter displays, bluetooth I/O, streaming/ethernet/Wifi/5G may be best handled by external devices dedicated to the task, and then just use USB, AES/EBU, LVDS/HDMI-format etc to talk to the DAC.
It would be interesting to get a re-do of some of Amir's measurements with a fully-hooked-up in a real-situation setup, with every single connector you'd actually be using plugged in to existing equipment -- spdif, aes, lvds, 12v-triggers, XLR-out, RCA-out, sub-out, etc -- in a standard home or apartment with tons of Wifi, 5G-cell usage, baby-monitors, wireless-intercoms, home-automation, wireless alarms, and a high-power AM transmitter nearby (e.g.
https://en.wikipedia.org/wiki/KFI ) that reportedly transmitted audible signal into people's dental-braces... all running as they would be during normal usage of the equipment.