Around here the .058 is mostly found on 3/8 equipped husky's but just as many seem to be .050.
Stihl is the usual .050 for 3/8 and .063 for .325, seems ass backward.
IIRC some chain brands like oregon use the same chassis/thickness for .058 and .050 and just grind the part of the drivers that ride in the groove down for the .050. So the chain chassis strength would be the same on either.
Not sure I'm on board with the wider drivers carrying more oil thing. If the saw pumped enough oil to fill the bar groove between drivers on any gauge, seems like the tank would be empty pretty quick...