Re: defaults for where to merge from

quoted

   git checkout -b branchname remote/upstreambranch
   git config --add branch.branchname.remote remote
   git config --add branch.branchname.merge refs/heads/upstreambranch

Is there a reason why "git branch" and "git checkout -b" should not
automatically do the two "git-config --add"s when the source branch is
remote?

I can see why that would be handy, but I often make short lived branches off a 
remote; and I wouldn't want my config cluttered up with branch defintions.

So, is there a reason why the config not could be cleared out by branch -d?

(The "is there a reason" has the same meaning: it seems obvious to me, 
but I surely miss a lot of usecases because of inexperience).

Paolo