Can anybody give me some information about the differences between a (old?) Connects share (full access) and the new +1 way of sharing an account.

Our case is that we have one main account. Users can connect their account so we can make a summarized overview of all connected accounts and make payments (real payments, no payment requests) on all connected accounts.

Is this case still possible with the +1 way of sharing? Documentation is not clear in this and support is not giving clear answers.