My ready example of a GitLab pain point is parallel matrix job names include the matrix variables and quite easily, in complex configurations, exceed the static 255 character limit of job names, preventing job creation/execution.

There's been years of discussion about ways to fix it with nothing moving forward.

https://gitlab.com/gitlab-org/gitlab/-/issues/263401

And the most recent tracking issue:

https://gitlab.com/gitlab-org/gitlab/-/issues/285853