This configuration (Quad,2gb,16gb) seems like a good minimum that you can use most apps without major problems and have enough space to not uninstall stuff all the time.
Plus now the used market has many high quality phones that are available. A used Samsung S5 should meet most people's basic needs. The difference between a 2018 phone and a 2015 phone is much smaller than 2015 and a 2012 phone.
As for place like India, there are plenty of phones in the $80-$99 range that meet these specs. And many that are at the $40-50 price points that have worse specs but still usable.