Of course, I would love to elaborate. We found that there was a lot of duplication between .com and .org. Same news (tweets, blog posts), overlapping email lists, overlapping members, etc. That duplication lead to duplicate effort, confusion, people missing news or comments on news, and bad SEO.

The reason for having two sites in the first place was to separate the open source project from the commercial organization. In practise the same people controlled both sides. It felt like a Potemkin village https://en.wikipedia.org/wiki/Potemkin_village

We realized that it doesn't help to present yourself as an independent project when you are not. What matters is that the commercial organization is a good steward of the open source project. So we detailed how we want to do that https://about.gitlab.com/about/#stewardship and instituted a core team https://about.gitlab.com/core-team/

At times situations will come up that will allow you to show your true colors. For us it was the VLC people asking to open source a feature on HN and our competitor Perforce adopting GitLab. How you handle those situations is far more important than having multiple domain names.

I recommend that you consolidate everything under one website but you open up your company. See https://about.gitlab.com/handbook/ for inspiration.