Double post, but I should also add in that collecting these parts is also mostly useless because they do nothing until we can fight Seraphis, who has so far only appeared as a PADR-exclusive descend.
I am aware that there are supposedly rumors that Radar Dragons and Seraphis will become available guerillas without the need for PADR, but nothing is certain since this hasn't even happened in JP yet, and it's extremely likely that GH will screw everyone internationally out of PADR and keep it to themselves just like PADW. Yes, I realize they wouldn't give us the parts without plans to give us Seraphis himself, but I just feel that until we can for sure get him somehow, I find jumping the gun a bit wasteful right now.