As I understood it was:

#drupal - development focused
#drupal-support - support focused - for newbies

The problem is that #drupal  is the first place newbies will think
of to get support. Once they are there, they are greeted with the
"support?" reply telling them to go to #drupal-support.

This can be offputting and make people feel unwelcome. They
ask the first question and get a reply that amounts to : "we don't
serve your type here, buzz off!" (plagiarised from Esmerel)

So, I don't see why charters can change, with development
in #drupal-dev (and only development), then #drupal become
community focused, has support, infra discussions, and everything
else that is not development.