Why don't normal Trials drop anything?

[Reynhart]

if it only has story where are people going to get i380 gear besides the Marketboard?

If they don't drop items, you won't have to do the same boost in required ilvl. In ARR, there was no "normal raid" so you only had a 20 ilvl gap between uncapped and capped tome, and uncappe tome gear was enough to meet the ilvl requirement.