I think the problem is the mix of both type of fusion , making it more unfriendly to complete .
If its a trad fusion , you know ahead to grind stuff ahead of time
If its a frag fusion , you know to get rdy for events with no pre prep stuff like trad fusion
These half n half fusion , seems like to put a bigger stress on the player over both frag and trad fusions ...but thats just my random opinion from a 94 days in player !
That's not really the problem. The resource use is comparable. It's more the time investment that us tough