I understand the system perfectly and for us it sucks.
I've been top tier in airline plans for 40 years straight, and trust me the calendar year system (as used by most of the worlds FF schemes) works best - IMHO.
Those Airlines do not "give way" 12 months of status "free" - I'd suggest you are the one who clearly does not understand how the real FF world majority - outside Virgin, works, and has worked, for decades.
One needs to EARN Status before December 31 each year. Simple. Get to 100,000 flown Miles, or 100 flight segments on United by December 31, and you are 1K for the next year. Easy to understand and plan around.
I don't think you understood what the previous post was intended to mean.
With United, for example, when you are first attaining status, once you get to 100,000 flown miles/100 segments within a calendar year, I believe your new status takes effect immediately, and is valid until the end of the following calendar year. Qantas works basically the same way except based on an "anniversary" date instead of the calendar year.
Anyway, with these systems, it is true that people usually get more than 12 months of status when they first qualify, and in theory they could get almost 24 months (I believe that is what Vic meant when he referred to "upto an extra 12 months of status recognition for free"). Conversely, with Velocity, your new status is valid for 12 + 1 months no matter when you achieve it.
This is actually a downside for the customer of Velocity (and KrisFlyer) versus most other programs. However, it's only an issue when you first reach a new status level, and even then irrelevant if you're able to retain that new status on an ongoing basis.
Aside from that, @ozstamps, you still haven't explained why you believe the rolling system works to your disadvantage.