I've landed on a similar process, but one file per sprint instead of one file per day.
I take the last sprint's file, save a copy for the new sprint, summarize what got done to report in sprint meeting, then add the tasks for the new sprint to present at the meeting as well.
Still have JIRA tickets to track tasks in a more formal way. But the text file is far more flexible and easier to quickly edit and view everything at a glance, as well as including things that don't fit cleanly in a ticket.
I take the last sprint's file, save a copy for the new sprint, summarize what got done to report in sprint meeting, then add the tasks for the new sprint to present at the meeting as well.
Still have JIRA tickets to track tasks in a more formal way. But the text file is far more flexible and easier to quickly edit and view everything at a glance, as well as including things that don't fit cleanly in a ticket.