A page view for columns allows a single url to be associated with the
tasks in a column. This helps a variety of use cases along the lines
of "please go look at this" instead of "go to the board and here are
the instructions for what I want you to look at".
It also allows batch actions to be taken on the tasks in the column.
For example closing all of the 'Done' tasks, commenting on all the
'Needs Info' ones, or adding another project (ie bumping them to the
next sprint). However, it dodges all of the complications of
arbitrarily complicated search predicates (you can only "search" for
one column in one board at a time). This will also support ad-hoc
actions after the task has been moved but before a relevant T5474