Too many things in Gitlab feel half-baked, like their requirements feature which is essentially just their issue tracker, no document management, just toss some issues in the bin. And they expect enterprises to pay for it because they checked the feature box. https://docs.gitlab.com/ee/user/project/requirements/
I've had a good experience using GitLab for source code repositories, pipelines, and code reviews. I don't have much experience using it for issue tracking and document management since we use Jira & Confluence for that. For my own hobby projects outside of work the free tier has been great, and it was easy to host my own gitlab runner so that I don't have to pay for CI/CD minutes.
That being said if I were a CTO I would not buy their services, I think they are too expensive.