I never even knew this bone conduction was a thing until I read this. Sounds like a good idea if it prevents feeling cut off from your surroundings.
I think generally, unless you're on your sofa with a pair of closed back headphones, any situation where you're out and about calls for situational awareness, if only to make it less likely you'll get run over or mugged. I got some Buds free when I bought my Sadsmug S21 but I rarely use them and they would defo fall out of my ears if I tried to run with them. They sound alright when they're correctly positioned, but even with the phone in my pocket they drop the link sometimes. Kind of glad they were a freebie on a phone I was gonna buy anyway.