Someone tweeted about it shortly after my post when live, Delve does look interesting and a lot more compatible with go in general, but there is significant appeal around being able to use a general debugging tool with go. It's the classic balance of solving a generic problem fairly well vs solving a simple problem very well.
I'll certainly be watching delve closely and using it myself! I am sure I'd have better luck having specific go issues resolved with the delve team since it's a focussed project.