It was supposed to be about the end of June but whatever. It could be one of the best forum improvement currently needed. Seeing how the situation is...

You sure about that? Wasn't that the reporter badges? Pretty sure he said by the end of the year for the recovery system.
We should not stop ban users to post in this section for all I know that it is being allowed by the admin of this forum. This is being specified in this thread
Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ25. If you get banned (temporary or permanently) and create a new account to continue posting / sending PMs, it's considered ban evasion. The only exception is creating a thread in Meta about your ban.
Besides a user has also the right to know why he has ban in the forum and so does the staff or moderators to follow their interpretation of the rules.
The rules can be amended. Besides, they're 'unofficial' and I don't think anyone is trying to prohibit users protesting or appealing completely, but rather to limit the number that are needlessly doing it and also clogging up Meta in the process. If the way bans are issued changes and the reason is stated then users won't need to create a new account to ask why they're banned as they'll know. Some will still inevitably protest but people are proposing it should just be in a separate 'ban issues' subboard.