The login header URL points to ClassicPress, which of course is very nice for ClassicPress, but I would like to think that anyone would expect to be taken (back) to the homepage of the site when clicking on it.
I always change it on any of the sites I build for clients, but I would like to petition this to be changed so the default becomes the homepage of the site.
Yes it does. And I think it is the adequate thing to happen.
If the standard logo (CP or WP) is shown, I do not see why someone would expect that to lead to the website’s homepage. It is a WP (for WP users) or a CP logo, and thus … obviously links to the instance it represents.
Luckily CP users can change that logo easily. WP users can’t (within the GUI)… but that is not our problem
So I would say this petition is a nay, it is ok the way it is, IMO, agreed.