As a non infra guy I'll say this. I'm curious about Linear. At my own company I vibecoded my own project management app against the JIRA API because I can't stand our version of JIRA. It's too many clicks, too many things to remember and it's unintuitive.
Theses days AI in doc, spec and production lifecycle means we need AI first ticket tooling - haven’t used Linear but I suspect that works far better with AI then JIRA