My reckoning is the 10mm is a good all around safety gun. Good for bears. Great for human threats when out in the deep country. If you aren't packing a rifle that is
The round size you’d need to drop a bear quick basically implies you should hike with a rifle. So if you can’t do a single shot approach that makes sense (ie hike with a rifle), multiple shots with lower recoil and suitable bear load seemed logical. Then YouTube Alaska guy did all the ballistic pros/cons too.