Finally, it's arrived !!
People who decide to subscribe near the end of the month won't be charged twice (once when they chose a tier, and again at the start of the following month), instead, as you can read in the screenshot above, the billing cycle will be from date of subscription, to date of subscription !!
As it should have always been, if you ask me.
So I'm very happy to announce I've actually made the change to once and for all end the double charging.