There are many places to view card details, but few places to update the most important attributes -- Assignee, Position, and Title:

Linked cards diagram view
Bulk edit view (in linked cards diagram)
Linked cards tabular view (card > hierarchy > detail view in kanban board)
Card > all cards (or card types) tabular view
card details view (from linked card view

Please allow me to update at least the card position(board/lane/column), assignee, and subject line.

...This is even more important in the table views where I might quickly update and assign child items of a specific effort hierarchy.

Without this, I have to click around, hunt around boards/backlogs, search by card ID, etc., for every member of a specific hierarchy.