Precisely the one reason I can't bother to use it for real: I'd like the source tree to be the default view.
That's a strong statement... I prefer bitbucket default view actually. The fact I can see the latest commits right at the start is very useful to me.
I'm glad to see they have changed this; navigating to a GitLab project now shows you the readme. Definitely going to give it a long hard look to see if I can switch again.