Sharing my experience:
One of my wheels had air problem: Tire guy could not figure out what was the reason. I keep driving getting air every week, for a year. I changed it last week. The mechanic showed me inside the old tire, it had good amount of rubber scrubbed from the inner tire.
If we drive vehicle with low air pressure, the inner tire wall starts thinning gradually. : It is not okay to drive vehicle with low air pressure for a long time. I was suggested not to drive flat tire to nearest gas station/ rather use extra tire.

गोर्खे भाई कोमोंन सेन्स इउस गर न ब्रो. Flat tire ma drive garyou bhane ta feri tire matra hoina wheel nai fernu parla ni, rims bangine chance huncha bro. ani Bro le 1 barsa samma kasto haptai pichhe hawa haldai chalayeko ta... paila nai ferdinu parcha ni bro tire.. bekar ma tyetro dukha garera bro le, khayeko pani jiu ma lagena hola.

Tires were decent : Couple times checked by tire guy, could not find any leakage. Never drove to damage rims, Later bought a machine.