Neat. I've been using the ores a bit but 100 ores (Well it is just 5 items I suppose.) and mostly blues and a few purples well it's better to just grind for the weekly guaranteed item so far. Even if it is weighted (Which probably can't be easily confirmed.) it could still take 100's of ores before you land on a legendary and with one-time only some 500 ores in total in-game that's not a lot for chancing.
Compared to Origins it's not just cosmetic this time either and some of the armor has unique bonuses and set properties although I don't know about the weapons that well though it would likely entirely depend on the playstyle.
(Also seems staves are not very common for legendary gear from what I've found so far.)
Hmm if you do get a item via the Olympian I guess it would be single item only and not the set from using Helix either, getting a full armor set would be very unlikely in that case from just the ore resources.
(Especially if the price keeps varying or increasing.)
EDIT: Would be interesting to see this system opened up again though but I wonder if Ubisoft is more reactive this time but I guess we will find out if.
(Overall it would be limited to PC and only a small subset of the total players so probably not too big of a concern, we shall see I suppose.)