Greetings,
Previously this was brought up in a guild meeting with ZoS and it was flagged as likely being a bug. Unfortunately, it's gone into live as-is.
As the daily delve and daily world boss boxes drop Trinimac and Malacath motifs respectively, there's a disparity with the number of chances you have to get each motif.
With the ability to share daily world boss quests, you can complete 56 world boss daily quests per an account per day.
Without the ability to share daily delve quests, you can complete a total of 8 daily delve quests per an account per day.
Is this intended? Is the drop rate of Trinimac motifs higher as a result?