Sorry about that. In future I will quote my sources.
True, the Aventine is a test bed of new technologies at the moment. But a working quantum slipstream drive in a Federation starship is a major leap in technology and capability. Like fighters moving from propeller driven propulsion to jet engines or breaking and surpasing the sound barrier. Such a leap that previous classes have been rendered obsolete if they cannot be fitted to the new drive system.
How DARE you not quote your WIKIPEDIA source and their dictionary definition of a flagship, which, if you had written yourself, would have been almost the same! This is an egregious error! Please, please, don't let that happen again.