Earlier quoted context omitted.
"Don't roll your own security" has been the marching drum of an entire sector of IoT companies working within the connectivity "slice of the pie." The general mindset has been that iot has a couple slices: the "thing" (air conditioner vibration sensor), how that thing is connected (Ethernet plugged directly into a smart vibration sensor, or vibration sensor plugged into a connected data-recording device), the transmi…
...and even then, you're not secure forever. So many times the best security practices have been shown to be insufficient. In fact, I wonder what the scoreboard actually would read, 'roll your own' vs 'best practice'? Maybe not all that different.
As for forever, hence why companies like Microsoft and EI have models for "continual update" on connected devices The idea being that the security upgrades never stop.