The Structure add-on does a great job of rolling up. The Portfolio product was way too difficult to use--they rebuilt it so maybe things might be different now.
I agree there are/were the best in class for the money--but with Atlassian throwing all their resources into cloud now, raising the prices on on-premise, I worry for its future. I suspect we're only going to get timid features--nothing bold that might improve the UX/UI, or anything that will break the migration path to Cloud, which is their end-goal.
If I was starting out again, I'd probably examine YouTrack where there's at least some assurance they are investing in its future.
No, cloud is slow and has been slow for years. On-premise is quick enough, but only if you ensure you have no slow bottle-necks (DB, spinning disks, heavily shared virtualization).
Jira doesn't use Spring--you may be confusing it with Confluence which does.
I agree there are/were the best in class for the money--but with Atlassian throwing all their resources into cloud now, raising the prices on on-premise, I worry for its future. I suspect we're only going to get timid features--nothing bold that might improve the UX/UI, or anything that will break the migration path to Cloud, which is their end-goal.
If I was starting out again, I'd probably examine YouTrack where there's at least some assurance they are investing in its future.