NOTAMS were written in a format that matched the method of transmission. Whilst technology may have moved on in some parts of the World, sometimes it is necessary to retain the Lowest Common Denominator to allow for others where technology has not caught up.
I recall filing a flight plan at Banjul Yundum and the gentleman in the mud hut transmitted my plan using a morse key!
We still use Magnetic Compasses, Pressure Altimeters and AM radios for much the same reason.