[kalleboo]

Ever since the analog TV shutdown and the refarming of those low frequencies to 4G LTE, you see that 4G actually has higher coverage than 2G/3G (this both in sparsely-populated places like Australia and dense ones like Japan).

And for 2G especially GSM has a physical cell size limit due to TDMA that LTE does not have so in sparse areas the same transmitter location can reach further.

If in your country 2G still has better coverage that's not due to technical superiority of the standard but due to decisions made by the operator.