Official comment
Sorry you're disappointed Giulia.
We carefully prioritize investing in features and functionality that we believe - based on many years of experience working with many thousands of clients in all industries, as well as interest demonstrated here by votes (3) - is going to make the biggest difference for our clients.
While I see that you are passionate about this feature, it is a very uncommon request. Coupling that fact with our knowledge that further complicating groups will actually confuse, and not serve, most clients, this has been an easy request to deprioritize.
Meanwhile, in the last 9 months, we have launched all-new Pages v3, autosave and version history, and about 30 other features, along with twice-weekly releases per our normal process.
I suspect that your search for a more powerful email marketing system is very likely to leave you frustrated. Ontraport is unquestionably the industry leader in the small business space when it comes to power and flexibility of automation, CRM, landing pages and campaign reporting. Of course there are parts of the app that could be improved, but we're constantly at work doing just that.
Perhaps if you asked the Facebook group how to accomplish your specific use case, you'll get ideas. Or, maybe you'll spawn a revolution that makes us rethink the prioritization of this functionality.