“Without maintenance” might be a better way to put it.
The NG delivery grid is rock solid and doesn’t require constant tweaking to keep it supplying product to customers.
The compressor stations I’ve helped design, construct and commission that pressurize those systems are not likely going to be running if they go a year without maintenance. Many other components in the well to customer are going to be the same.
While I agree there is far less work in the NG delivery system, a year isn’t anywhere reasonable to expect. They have less exposure than an above ground electric distribution system, but you may not be aware of all the parts and pieces required for the complete system.
If you only compare the local distribution and not the total system needed to bring gas to your home, then you may be right.