Hi! GitLab Community Advocate here - I agree that we need to get better how we improve the quality and performance of existing features/bugs. I am sorry for the negative experience you had. Please ping me on any long standing issues/bugs that are important to you and I'll do my best to route it to the directly responsible individuals.
For the new features part, going fast is a core part of our strategy, as is focusing on breadth over depth (https://about.gitlab.com/company/strategy/#breadth-over-dept...). Not only does this provide an easier path to collaborate and contribute for the wider community, it allows us to shorten the feedback loop with everyone that uses GitLab so that we can invest our time and effort in the areas that matter most to the wider community.Hope this is helpful.