Converting all legionaries' armours from hamata to segmentata? Tha's a nonsense!!!
It's proved that the lorica segmentata had never been the widely standard imperial armour. And that's why the concept of "standardization" as in modern age was completly unknown in ancient age.
Romans have a general idea of a "panoplia", a general type of equipment for heavy infantry, but they didn't ever said "ok guys,all legion must have this shoes,this type of scutum" etc.
Exceptions and variants possibilities were common: roman chose their equipment depending of what type of enemies they have to face.
Lorica hamata NEVER disappeared in roman legions.
Let's take a look, for examples at the Tropaeum Traiani and in the Asdamclisi Musueum: there you can also see legionaries of Trajan wearing lorica squamata!!!
Later, lorica hamata re-became more common in legions than the segmentatas after Septimius Severus.