I reached the same conclusion: modals are excellent at helping people quickly dive into multiple items on the list while keeping their main mental context in the listing view. I call it "Hummingbird mode" - zoom in, zoom out, jump around.
For example, you are running a project review meeting and want to quickly jump between tickets on the kanban board. Your main business context is the entire board (you might have filters/sorting), and you keep a mental record of where interesting tickets are placed on the screen. However, during the group discussion, you need to quickly jump into an individual ticket to reassign it or scan through comments for 5 seconds. In this case, using a modal to show ticket details is preferred to redirecting to a separate 'details' page because it does not scramble the user's context and their mental model about what's on the screen. Of course, the UI still should support cmd+click to open a full page dedicated to that ticket, but that's a 10% use-case.
For example, you are running a project review meeting and want to quickly jump between tickets on the kanban board. Your main business context is the entire board (you might have filters/sorting), and you keep a mental record of where interesting tickets are placed on the screen. However, during the group discussion, you need to quickly jump into an individual ticket to reassign it or scan through comments for 5 seconds. In this case, using a modal to show ticket details is preferred to redirecting to a separate 'details' page because it does not scramble the user's context and their mental model about what's on the screen. Of course, the UI still should support cmd+click to open a full page dedicated to that ticket, but that's a 10% use-case.