Would be nice if V still canceled Burn Drive even with SO, just to avoid some "dang you muscle memory" moments.
Muscle memory moments is the main reason why I do not want to use SO on my flagship. The muscle memory moments cost too much time that can be deadly in a fast-paced, twitch fight. Perks that add hard flux dissipation help a bit. Otherwise, it hurts when I need to dissipate flux now, but V does not work, and I waste about a full second reacting to vent failure, which is too long.
And back during the 0.7 era releases, I used the vent button to cancel burn drive. Burn Cancelling helped Dominator and Onslaught being best-in-class during those release. Combined with the speed hullmods and perks at the time, they were the ultimate kite-and-snipe ships. That was low-tech's strength before 0.8, run away from everything while gunning them down with efficient and long-ranged ballistics while Vulcans and Dual Flak mulched everything that got close. (There was no minimum armor back then.) No need to armor tank if the enemy was outranged and could not shoot back.