[that_guy_iain]

It's core product is git hosting, you use it to host your git repositories. You use features such as Pull Requests to power how you merge within your git repositories. If the issue system isn't working it's not a big deal, but if we can't use git it's a massive deal. It's all in the name GIThub

Most companies don't use GitHub's issue management system they use issue management tools such as JIRA, Trello, etc. Issue management, project management, CI/Actions, wiki, discussions, etc are all nice to haves and are probably more aimed at the open source projects that are used as a marketing tool.

[mort96]

Most open source projects (you know, the thing GitHub claims to exist for) do pretty much exclusively use GitHub issues for issue tracking though. GitHub makes it pretty difficult to be on GitHub and not accept GitHub issues.

[that_guy_iain]

But open source projects are not what keeps GitHub in business that is just marketing. Companies paying for git hosting is.

You can easily disable issues.