[2020] Can't Use All Console Commands as Admin?

No, dangerous and QA / Dev commands are no longer available to everyone. They can only be used by Dev-Tier users in singleplayer for development purposes or by SLG Staff.

This was done due to a multitude of issues caused by admins trying out QA commands, destroying their server permanently, some then even blaming SLG for a 'bug' towards their angered playerbase.

I'm not sure, but longterm we plan to introduce a creative mode anyway.

That was the case before, but people used it to break worlds a lot and complains fell back to us, so we disabled them. If you break your server, you need to at least take responsibility, but the majority of servers didn't. We will not change this decision.

They won't. They are intended for development and QA purposes and are solely available for that, my statements above still stand.