Oh dude, we were talking specifically about the Event materials, haha. My only problem with Limit Break materials is waiting an entire goddamn week since I always end up building a single-element squad the day after or the night of their SP quest day.
In regard to raids, we actually JUST had a conversation about this in the Discord channel, and I've been informed that Standard is the way to go. The plat boxes still drop weapons, I've seen plenty of them myself. And the Eidolon is hot garbage. So really, getting two chances for your stamina in Standard rather than one long and annoying one in Expert is definitely the way to go.