Interesting, I looked at Linear as well and no doubt, it's a very polished product with food UX/UI, etc.
But still is very much Issues oriented, no ?
What i wanted to do with AJIR is create something that has both Task management and Product/Features documentation in a well integrated way, i.e. having a documentation that is 'self-organized' in the very same hierarchy than your Products/Features tree.
Was I clear enough ?
We've switched from JIRA to Linear.app more than year ago, and never looked back. With JIRA our team members were getting blocked in the flows quite a bit, now with linear we're much more efficient.