It's kinda the game to hunt for these parts and be frustrated by the drop rate. Never bought anything Prime.
The danglies are the only thing i would want but i think Prime Access is very expensive.
Theres enough credits at Seimeni / raids, Enough XP at Any Def / Survival and materials kinda just come to you if you play a balanced game.
I do have more spare time than the average person I will admit so maybe shortcuts suit others.
Maybe you are making a contribution to the upkeep of DE and the purchase of some servers for them, that would be noble and I thank you for your contribution on my behalf