GitLab Issues, especially as exposed by the UI is just ludicrisouly primitive vs Jira. They're trying to cover the GitHub use case regarding basically 'context for merge requests'. There's no planning, reporting, sane linking, reports, no query language, no batch updates, and visibility model means Issues edits are also basically committers, so good-bye segregation. It's just chalk and cheese.
Someone invariably says 'with the REST API you can do ...' which now means we have hundreds of teams reimplementing the out-of-the-box Jira features in mutually incompatible ways for their own consumption. All of that dev time is gone. I honestly hope the shareholders don't find out.