Does it literally have to be individual JIRA tickets? No way, but going off for 2-3 weeks doesn't give the business the insight it needs to in order to wisely invest time/effort into work being executed.
[1] https://medium.com/machine-words/a-guy-in-a-room-bbbe058645e... (I thought Joel Spolsky said this but I can't actually find the original source, if anyone has it I'd appreciate it!)